The Boy Mechanic Volume 1

8/13/2019 The Boy Mechanic Volume 1

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Project Gutenberg's The Boy Mechanic: Volume 1, by Popular Mechanics

This eBook is for the use of anyone anyhere at no cost an! ithalmost no restrictions hatsoe"er# $ou may copy it, gi"e it aay orre%use it un!er the terms of the Project Gutenberg &icense inclu!e!ith this eBook or online at #gutenberg#net

Title: The Boy Mechanic: Volume 1

(( Things )or Boys To *o

+uthor: Popular Mechanics

elease *ate: -une 1., /((0 2Book 31/4556

&anguage: 2nglish

7haracter set enco!ing: 89%..5;%1

M2 1


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The Boy MechanicVol. 1700 Things for Boys to Do800 Illustrations Showing How


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Jac Mansfiel!"#!

Jan $8% 1&'8

(ugust 1&1)

*ro+ Mother


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TH# B,- M#H(/I V,M# I


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Transcri2er3s /otes4

This te5t accurately re6ro!uces the original 2oo e5ce6t for a!herence to roect 9uten2urggui!elines. #ach 6roect title is followe! 2y its original 6age nu+2er to allow use of theal6ha2etical contents :in!e5; at the en! of the 2oo. The 2oo use!


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How to Mae a 9li!er :See 6age 171;


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THE

BOY MECHANIC

VOLUME I

700 THINGS FOR BOYS TO DO

HOW TO CONSTRUCT

EI##SS ,T*ITS% B,(TS% (M #@IM#/T% (#I(.9ID#S% FIT#S% S#*=,##D V#HI#S #/9I/#S% M,T,S% ##TI(

(((TS% (M#(S(/D

H/D#DS ,* ,TH# THI/9S EHIH D#I9HT #V#- B,-

WITH 800 ILLUSTRATIONS

,-I9HT#D% 1&1'% B- H. H. EI/DS, HI(9,

POPULAR MECHANICS CO.BISH#S


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A Model Ste! E"#$"e %&'

The acco+6anying setch illustrates a two=cylin!er single=acting% 6o66et


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as a 6attern in filing the other to sha6e. (ttach+ent to the shaft% /% is 2y +eans ofsetscrews which 6ass through the slee


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During the winter +onths e


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*ig. 1% *ig. $% *ig. ' *or+ing the Sis

of the si will 2e raise!. Tac on a 6iece of shee6sin or !eer hi!e where the foot rests%*ig. .

The 2est finish for sis is 2oile! linsee! oil. (fter two or three

*ig. The Toe Stra6s

a66lications the un!er si!e will tae a 6olish lie glass fro+ the contact with the snow.The si=to2oggan is +a!e 2y 6lacing two 6airs of sis together si!e 2y si!e

*ig. L Si=To2oggan

an! fastening the+ with two 2ars across the to6. The 2ars are hel! with V=sha6e! +etal

cli6s as shown in *ig. L. ==ontri2ute! 2y *ran Sco2ie% Slee6y #ye% Minn.

Ho!e!de L$e P*e-e*1e* %2'

rocure an inner tu2e of a 2icycle tire% the close!=en! in!% an! fol! it in fouralternate sections% as shown in *ig. 1. ut or tear a 6iece of cloth into stri6s a2out 1G$in.wi!e% an! not the+ together. *asten this long stri6 of cloth to the fol!e! tu2e an!wea


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*ig. 1% *ig. $ == Inner Tu2e an! o


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the greatest a+ount of 6leasure to the nor+ally healthy 2oy or girl.The snow house of the #si+o is 6ro2a2ly the unhealthiest of 2uil!ings +a!e 2y any

sa


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throughout will hol! u6 a snow house 6erfectly% if its to6 is no +ore than ) or 7 ft. a2o


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Ehen taing hot !ishes fro+ the sto


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an! the 6erfor+er ste6s out in


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the e!ges shoul! 2e left s+ooth% a +etal file an! e+ery 6a6er 2eing use! for this6ur6ose.

If a touch of color is !esire!% it +ay 2e ha! 2y filling the etche! 6arts with ena+eltinte! 2y the a!!ition of oil colors% such as are use! for ena+eling 2athtu2s. (fter thishas !rie!% s+ooth it off with 6u+ice stone an! water. To ee6 the +etal fro+ tarnishing%co


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2otto+ ring. This will 6ro


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(n or!inary electric 2ell% (% *ig. 1% ha


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Ear6ing the (ero6lane Eings

shown in *ig. $% the weight !raws the lines to war6 the 6lane so it will right itselfauto+atically. ==ontri2ute! 2y ouis J. Day% *loral ar% /. -.

Re)$*$"# C*$-t!-T*ee De(o*t$o"- %&&'

S+all glass orna+ents for hrist+as tree !ecorations are


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If two wing nuts ha


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(ll 6arts of the to6 are of woo! an! they are si+6le to +ae. The han!le is a 6iece

of 6ine% L=1G in. long% 1=1G in. wi!e an! 'G in. thic. ( han!le% 'G in. in !ia+eter% isfor+e! on one en!% allowing only 1=1G in. of the other en! to re+ain rectangular insha6e. Bore a 'G=in. hole in this en! for the to6. ( 1G1)=in. hole is 2ore! in the e!geto enter the large hole as shown. The to6 can 2e cut fro+ a 2roo+ han!le or a roun!stic of har!woo!.

arts of the To6

To s6in the to6% tae a 6iece of stout cor! a2out $ ft. long% 6ass one en! through the1G1)=in. hole an! win! it on the s+all 6art of the to6 in the usual way% starting at the

2otto+ an! win!ing u6war!. Ehen the shan is co


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Po(,et- o* S)ool- o T*ed %&/'

( !etacha2le 6ocet for hol!ing threa! when sewing is shown herewith.The !i+ensions +ay 2e


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A B*oo! Holde* %&/'

Broo+ Hol!er

(


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for loa!ing an! !e


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Ho!e!de So3e* Bt %&5'

( Shower Bath That osts ess Than ,ne Dollar to Mae

Ehile in the country !uring


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with a curtain or a 6anele! !oor as shown. ==ontri2ute! 2y 9il2ert (. Eehr% Balti+ore%M!.

*I9. 1 *I9. $loset for Hol!ing ot o


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2leacher is +a!e u6 as follows an! shoul! 2e 6lainly +are! Noison.N

yani!e of 6otassiu+ .............. $ o.Io!i!e of 6otassiu+ ............... $0 gr.Eater ..................................... 1) o.

lace the !ry 6rint% without 6re


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*ig ' a6er orners for Blotter a!s

2e easily change! 2y re+o


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*I9. 1 *ig. $The attern an! the *inishe! Boo+ar

hea! an! the e5tre+e length =1G$ in. Mae one=half of the !esign% as shown in *ig. 1%freehan!% then trace the other half in the usual way% after fol!ing along the center line.

Trace the !esign on the +etal% using car2on 6a6er% which gi


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Cee-eo9Co1e* Te T*< %&8'

The co


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A Flt$*o" Re-t %&:'

The iron rest an! wall hanger shown in the setch is +a!e of sheet iron. The u6turne!e!ges of the +etal are

Boar! or Eall Iron est

2ent to fit the slo6ing si!es of the iron. The hol!er an! iron can 2e +o


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Ehen the 6ens are all fastene! two 6ieces of +etal are 6ro


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lining. If all the 6arts are well san!6a6ere!% the woo! will tae the stain nicely4 Threeyar!s of cretonne will +ae a


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The characteristic notches shown in the co+6lete! arrow% *ig. '% are chi66e! out 2ystriing the 6iece lightly at the reuire! 6oints with the e!ge of an ol! hatchet or a hea


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oncrete *or+s

2uil! an! will ee6 in goo! sha6e for +any years.The !i+ensions an! the +anner of +aing the for+s for the concrete% an! the

location for the 2olts to hol! the 6late an! rafters% are shown in the !iagra+.==ontri2ute! 2y #!ith #. ane% #l aso% Te5as.

N4t-ell Poto#*) No1elt< %+2'

S6lit an #nglish walnut in the center% re+o


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cooing utensil. The co66er is not har! to 2en! an! it can 2e sha6e! so that the !e


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*inishe! ac

with +ission=style furniture can +ae such a rac of the sa+e +aterial as the !es% ta2leor roo+ furnishings an! finish it in the sa+e +anner.

The !i+ensions are gi


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!oorway% 2y screwing to the floor% an! to the outsi!e 2oar! of the si!es. (t the to6 ofthe !oorway% fi5 a narrow 6iece 2etween the si!e 2oar!s% thus lea


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Details of the Dar oo


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in *ig. 1'. The !i


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co66er shoul! 2e% the wor will cause no trou2le on account of inaccessi2ility. ==ontri2ute! 2y #. 9. S+ith% #urea S6rings% (r.

S!oot$"# P)e* te* E*-$"# %+:'

Ehen an in line is erase! the roughene! surface of the 6a6er shoul! 2e s+oothe! or6olishe! so as to 6re


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Base Ma!e=of ors

The +any for+s of roun!=2otto+e! glass 2ottles use! in che+ical la2oratories reuireso+e s6ecial in! of su66ort on which they can 2e safely 6lace! fro+ ti+e to ti+e whenthe che+ist !oes not% for the +o+ent% nee! the+. These su66orts shoul! not 2e +a!e ofany har! +aterial nor shoul! they 2e goo! con!uctors of heat% as such ualities woul!result in freuent 2reaage.

( *rench +againe suggests +aing the su66orts fro+ the large cors of glass ars inwhich crystal che+icals are usually su66lie! fro+ the !ealers. The +anner of +aingthe+ is clearly shown in the setch. #ach cor is cut as in *ig. 1 an! 6lace! on a wirering :*ig. $; whose en!s are twiste! together an! the last section of cor is cut throughfro+ the inner si!e to the center an! thus fitte! o


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(rtistic *lower Bo5es

A"t$dote o* S=4$**el Pe-t %/0'

To the owner of a gar!en in a town where suirrels are 6rotecte! 2y law% life in thesu++er ti+e is a


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attern for arts of the #lectric Stoe""el Doo* %/+'

Ehen the neigh2orhoo! cats are retire! for the night an! there is nothing +ore tochase% +y fo5 terrier see+s to realie that his usefulness

Diagra+ of losing Door

for the !ay is o


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The outer half ( of the hinge! tra6!oor is +a!e hea


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W$td*3$"# P)e* *o! 4"de* " I"1e*ted Bottle %//'

In


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A L$"e H*!o"o#*) %/2'

(s an a66aratus ca6a2le of e5citing interest% 6ro2a2ly nothing so easily constructe!sur6asses the har+onogra6h. -our attention will 2e co+6letely a2sor2e! in the e


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sli66e! 2ac so the nife e!ges engage in the V=sha6e! holes of the stirru6s. The cross+ust 2e so +a!e that the nife e!ges will 2e in the sa+e 6lane. This can 2e !eter+ine!

2y 6lacing two of the nife e!ges on the aws of a


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( ey car! for use in corres6on!ence on 6ostals that +aes the +atter unrea!a2leunless the reci6ient has a !u6licate ey car! is +a!e as follows4 ule two car!s the sieof 6ostal% one for the sen!er an! one for the recei


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the hotogra6hic Ti+es 6ro!uce! a


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wire so they will not touch each other an! fasten at each en! with a turn or two of /o.1) gauge co66er wire. Ehen this is co+6lete ha


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1 o. of glycerine to 1) o. of water%

Solde*$"# o* te A!te4* %/8'

Successful sol!ering will 6resent no serious !ifficulties to anyone who will follow afew si+6le !irections. ertain +etals are easier to oin with sol!er than others an! so+ecannot 2e sol!ere! at all. o66er% 2rass% inc% tin% lea!% gal


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Details of the Eall Bracet

Ho3 to M,e F$"#e* R$"# %/:'

Ehile the wearing of co66er rings for rheu+atis+ +ay 2e a foolish notion% yet there is acertain gal


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6liers an! the a!


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lace the car!2oar! co


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Hacsaw *ra+e an! Bla!e

s6ring or a cloc s6ring will !o nicely. Heat the s6ring enough to tae so+e of thete+6er out of it% in or!er to !rill the holes in the en!s% as shown% an! file in the teeth.Mae the 2la!e 1$ in. long% with 10 teeth to the inch. ( an! B show how the 2la!e fitson the fra+e. =ontri2ute! 2y Eillar! J.Hays% Su++it


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e


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the way./e5t cut out eight co66er or 2rass !iss% two for each ar. Their sie also !e6en!s on

the


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+onogra+ of the owner or owners of the sle!% cutting it out of sheet 2rass.*or the steering=wheel 6rocure an ol! freight=car N2raeN wheel% 2rass 6late!. *asten a

horn% such as use! on auto+o2iles% to the wheel.Mae the cushion of leather an! stuff it with hair. The 2est way is to get so+e strong%

chea6 +aterial% such as 2urla6% sew u6 one en! an! +ae in

onstruction a NEinnerN To2oggan Sle!

the for+ of an o2long 2ag. Stuff this as tightly as 6ossi2le with hair. Then get so+eu6holstery 2uttons% fasten a cor! through the loo6% 2ring the cor! through to theun!ersi!e of the cushion% an! fasten the 2utton 2y sli66ing a nail through the not. Then

6ut a leather co


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tree an! 2ring% the rays of a large +agnifying glass not uite to a fine focus on the sa+e.The tree will 2e 2urnt along the 6encil +ars% an! if the glass is not hel! in one s6ot toolong% the inscri6tion will 2e 2urnt in as e


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Ho3 to M,e S!ll Ge*3eel- W$to4t Lte %26'

To +ae s+all +o!els sun!ry s+all gears an! racs are reuire!% either cut for the6lace or 2y using the 6arts fro+ an ol! cloc. Eith no other tools than a hacsaw% so+efiles% a co+6ass%

Maing Mo!el Eheels

an! with the e5ercise of a little 6atience an! +o!erate sill%


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*our hotos on ,ne late

of the+% as shown in *ig. 1. Mae a hole in the other% as shown in *ig. $. Eith a lea!6encil !raw on the groun! glass one line


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( niue Battery

If a 6erson s6ea into the trans+itter% one at the recei


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wire. (t one si!e secure two rece6tacles% B B% an! one single 6ost switch% . laceanother switch at I an! another 2in!ing=6ost at *. The o


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6ur6ose of recei


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6erfor+ing electrical e56eri+ents. The setch shows how a s+all arc light an! +otor+ay 2e connecte! to the light socet% (. The light is re+o


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coffin. ( white shrou! is thrown o


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that is necessary is a two=6oint switch% 2y which either or M can 2e 6lace! in circuitwith the 2attery% an! a 6ress 2utton in circuit with the 2ell an! its cell.

If a gra!ual transfor+ation is !esire!% a !ou2le=6ointe! rheostat coul! 2e use!% so thatas one light !i+s the other increases in 2rilliancy% 2y the insertion an! re+o


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Si+6le Eireless Syste+

wireless telegra6hy 2y which I ha


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is then hel! near the +outh of the 2ottle a shar6 re6ort will 2e hear!.If the 2ottle is fitte! with a cor containing two wires nearly touching% an! the

a66aratus connecte! with an in!uction coil% in such a +anner that a s6ar will 2e6ro!uce! insi!e the 2ottle% the e56losion will 2lowout the cor or 6ossi2ly 2rea the2ottle. aution shoul! 2e use! to a


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la+6 cor!% 6asse! through a hole in the 2otto+ of the can an! notte! insi!e to 6re


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rocess of Ho+e+a!e Bin!ing

the wi!th of the thicness of the 6ac 6aste! on 2efore 6asting the cloth to the secon!2oar! 2ac.

ut off the corners an! fol! o


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Ho!e!de A""4"($to* %57'

Ehen one electric 2ell is o6erate! fro+ two 6ush=2uttons it is i+6ossi2le to tellwhich of the two 6ush=2uttons is 2eing o6erate! unless an annunciator or si+ilar !e


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lengths of * an! 9. ( 2owline not shoul! 2e tie! at J% as shown% to 6re


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fra+e% (% with a nu+2er of nails% B% !ri


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the current is shut off% it is safer than the or!inary cannon which is fire! 2y +eans of afuse. ==ontri2ute! 2y Henry ec% Big a6i!s% Mich.

S$!)le Ele(t*$( Lo(, %60'

The illustration shows an auto+atic loc o6erate! 2y electricity% reuiring a strong+agnet% 2ut no weights or strings% which greatly si+6lifies the !e


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Direct=onnecte! e


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2e co


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+i5ture of clay% )0W san!% 1LW an! gra6hite% $LW% nea!ing thoroughly in water to agoo! +ol!ing consistency. ine the 6ail% 2otto+ an! si!es% with hea


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Me!ical In!uction oil

as use! on tele6hone generators% aroun! the coil% lea


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% a2out $0 in. It shoul! 2e 6lace! in an e56ose! location% so that no inaccuracy will occurfro+ win! currents. To fin! the fall of snow% 6our a nown uantity

ain 9auge

of war+ water on the snow containe! in the funnel an! !e!uct the uantity 6oure! in fro+the total a+ount in the tu2e. ==ontri2ute! 2y Thurston Hen!ricson% ong Branch% /.J.

Ho3 to M,e " A=4*$4! %62'

In +aing an auariu+% the first thing to !eci!e on is the sie. It is well not to atte+6t2uil!ing a


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Detail of (uariu+ *ra+e

the ce+ent !ry three or four !ays 2efore 6utting any water in the auariu+.In choosing stoc for the auariu+ it shoul! 2e re+e+2ere! that a sufficient uantity

of


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neu+atic Door=,6ener

2rass% #% sol!ere! to the en! of the cylin!er. (ll this a66aratus is on the insi!e of the!oor an! is connecte! 2y a s+all ru22er tu2e% *% to a secret +outh6iece 6lace! at so+econ


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Detail of Ho+e+a!e Eaterwheel

2y 1 in. thic :HH% *ig. $; an! another 1 in. 2y 1=1G$ in. :I% *ig. $; for+ a su2stantial

2ase.ut the wheel fro+ sheet iron 1G1)in. thic% $ in. in !ia+eter. This can 2e !one

roughly with ha++er an! chisel an! then s+oothe! u6 on an e+ery wheel% after whichcut $ ra!ial slots 'Gin. !ee6 on its circu+ference 2y +eans of a hacsaw. ,n eachsi!e of the wheel at the center fasten a rectangular 6iece of 1G=in. iron ' 2y in. an!secure it to the wheel 2y +eans of four ri


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a water=tight oint.; *asten the cross6iece o


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In !e


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Interior View

the circuit the core will !escen! or 6ut in a switch or 6ush 2utton on one of the 2atterywires. If the 2utton 2e conceale! where the o6erator can reach it% the core will o2ey hisco++an! to rise or fall% accor!ing to his control of the current. This is a +ysteriouslooing instru+ent% the core 2eing +o


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ar!s fro+ a Ta6ere! Dec

one car! that has 2een turne! en! for en!.It is e


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reuires a +i5ture of a soli! an! liui! in its 6re6aration. ==ontri2ute! 2y . S. J.%Detroit.

Re-to*$"# To"e to C*(,ed Bell %7&'

Many a 2ell with a !ea!ene! tone !ue to a crace! ri+% can 2e gi


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The cone is 6lace! o


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stri6.(nother way is to !ri


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e


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6iece of har! woo!% 9. This is woun! with soft string% asshown in *ig. '% an! saturate!with thic oil. ( slot is cut in the en! of the 2olt #% to recei


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A M4-$(l W$"d!$ll %72'

Mae two wheels out of tin. They +ay 2e of any sie% 2ut wheel ( +ust 2e largerthan wheel B. ,n wheel ( fasten two 6ieces of woo!% % to cross in the center% an! 6lacea 2ell on the four en!s% as shown. The s+aller wheel% B% +ust 2e se6arate! fro+ theother with a roun! 6iece of woo! or an ol! s6ool. Tie four 2uttons with s6lit rings to thes+aller wheel% B. The 2la!es on the wheels shoul! 2e 2ent o66osite on one wheel fro+the others so as to +ae the wheels turn in !ifferent !irections. Ehen turning% the

2uttons will strie the 2ells an! +ae the+ ring constantly.

O)t$(l Ill4-$o"- %72'

By gi


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hea6 an! o+forta2le

the en!s as shown at B. Ehen finishe! the weight will then 2e su66orte! 2y four ro6es ateach en!% which allowsthe use of s+all sie! ro6es% such as clothes lines. ( ha++oc ofthis in! +ay 2e left out in the rain without inury. ==ontri2ute! 2y H.9.M.% St. ouis% Mo.

A S$"#$"# Tele)o"e %75'

Those who ha


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Detail of ensless Microsco6e

trans6arent celluloi! or +ica% cut out a s+all !is% B% an! fasten to the en! ha


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S,/D#=(. 2rass4 B. woo!4 . soft iron DD. coils woun! with /o. $)wire4 #. nail sol!ere! on ( **. 2in!ing 6osts4 H s6ring

The sto6% F% is a wire nail !ri


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How to Mae a Music a2inet

Shel


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Diagra+ of ,ne=Eire ine

line with groun! connections at each en!. (ny telegra6h set in which theey +aes !ou2le contact can 2e connecte! u6 in this way. ==ontri2ute! 2y . (.Brown% *air6ort% /. -.

Ho3 to M,e Wte* Reo-tt %78'

( water rheostat +ay 2e +a!e 2y fitting a 2rass tu2e with a cor% through which a6iece of wire is 6asse!. The 2rass tu2e +ay 2e an ol! 2icycle han! 6u+6% ( :seesetch;% fille! with water. ushing the wire% B% !own into the water increases the surfacein contact% an! thus !ecreases the resistance. (n a66aratus of this in! is suita2le forregulating the current fro+ an in!uction coil% when the coil is not 6ro


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for the secret contact% if !esire!%

(66aratus lace! on Insi!e of Door

2ut if there are no nu+2ers on the !oor% a s+all contact=2oar! +ay 2e constructe! 2y!ri


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whene


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Battery heostat

A4to!t$( T$!e S3$t( %80'

This !e


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Details of otary u+6

( si+6le rotary 6u+6 is constructe! on the 6rinci6le of creating a


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securely until you ha


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*ig.1 Details of Ho+e+a!e Battery

Doo*O)e"e* o* F4*"(e %8/'

The acco+6anying !iagra+ shows an arrange+ent to o6en the coal !oor of afurnace. Ehen a66roaching the furnace with a sho


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!escri2e! elsewhere in this 2oo. This coil% 2eing a 1=in. coil% will trans+it nicely u6 toa !istance of one +ile while a 1$=in. coil +a!e on the sa+e 6lan will trans+it $0 +ilesor e


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The aerial line% /o.) stran!e!% is run fro+ 2in!ing=6ost B through the choing ortuning coil% an! for 2est results shoul! e5ten! u6 L0 ft. in the air. To wor a $0=+ile!istance the line shoul! 2e 100 or 1L0 ft. a2o


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(sse+2le! athe Be! an! Bearing Details

The 2e! of the +achine is +a!e of woo! as shown in *igs. $ an! '% har!woo! 2eing6refera2le for this 6ur6ose. *ig. $ shows an en!


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other +achines. (fter the 2earings are co+6lete! the cone 6ulley can 2e 6lace! on theshaft. To +ae this 6ulley cut three circular 6ieces of woo! to the !i+ensions gi


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an! nail it together so as to +ae a tra6!oor that will wor easily. lace a s+all s6ringun!er one en! to hol! it u6 a2out 1Gin. :(% *ig. $;. /ail a stri6 of tin along the un!ersi!e of the tra6 near the s6ring an! fasten another stri6 on the 2ase2oar!% sothat theywill not touch% sa


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u6 to $ t. with water. Eith an electric 6ressure of '.L to


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rises at the o66osite en! an! allows catch B to fly forwar! an! release the 6iece of2roo+stic . The weight D then falls an! ers u6 the hoo=loc M% which unlocs the!oor% an! the hea


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*inally% you +ust ha


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a 2oy who can tal a goo! N6atterA ==as the +agicians call it == is often of +ore


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in the connections an! 6ro


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A S$!)le A((ele*o!ete* %:/'

( si+6le accelero+eter for in!icating the increase in s6ee! of a train was !escri2e!2y Mr. (. . Trotter in a 6a6er rea! 2efore the Junior Institution of #ngineers of 9reatBritain. The !e


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which has a 6iece of +etal% B% fastene! in such a 6osition that the +etal ro! % sol!ere!to the alar+ win!er% will co+6lete the circuit an! ring the 2ell. The two=6oint switch Dis close! nor+ally at #% 2ut +ay 2e close! at * any ti+e !esire!% thus turning on thes+all incan!escent light 9% which illu+inates the face of the cloc. Ehen the alar+goes off% the 2ell will continue to ring until the switch is o6ene!.

To >ee) Do#- "d Ct- A3< *o! te G*#eC" %:2'

ast su++er I was annoye! a great !eal 2y !ogs u6setting our gar2age can on thelawn% 2ut finally e5ecute! a 6lan that ri! the yar! of the+ in one afternoon.

I first secure! a +agneto out of an ol! tele6hone% then !ro


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Rel< Mde *o! Ele(t*$( Bell %:2'

It is not necessary to re+o


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near at han!% try using san! fro+ other sources% gi


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Ha


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# shoul! 2e co


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( +ol! +a!e in the +anner 6re


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(n ,6tical Illusion

is less 6ronounce! than it was in reality% it will 2e notice! that the rule a66ears to 2e2ent% 2ut sighting along the rule fro+ one en! will show that it is 6erfectly straight.

The 2rass rings also a66ear !istorte!. The 6ortions on one si!e of the rule !o nota66ear to 2e a continuation of those on the other% 2ut that they really are can 2e 6ro


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+elte! 2a22itt. If 2a22itt is use!% either thoroughly s+oe or chal the shaft or wra66a6er aroun! it to 6re


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shoul! flow lie water% 2ut the glaciers of Switerlan! an! other countries are literallyri


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thu+2 screws. The a!


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shows where an! how the !raft is regulate! !uring the !ay% the auto+atic

Draft egulator

!e


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(n electrosco6e for !etecting electrifie! 2o!ies +ay 2e +a!e out of a 6iece of note6a6er% a cor an! a nee!le. ush the nee!le into the cor% an! cut the 6a6er in the sha6eof a s+all arrow. Balance the arrow on the nee!le

Si+6le #lectrosco6e

as shown in the setch% an! the instru+ent will then 2e co+6lete. If a 6iece of 6a6er isthen heate! o


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6ro6er


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Ho3 to M,e Ne3 L"#4#e %&05'

(nyone 6ossessing a 6honogra6h can try a


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Shocing=Machine

==ontri2ute! 2y 9eo. E. *ry% &0'Vine St.% San Jose% al.

A" A4to!t$( Lo(, %&06'

The illustration shows an auto+atic loc o6erate! 2y electricity% one cell 2eingsufficient. Ehen the circuit is 2roen a weight% (% attache! to the en! of the ar+ature B%ten!s to 6ush the other en! of the ar+ature into the screw eye or hoo % which is in the!oor% thus locing the !oor.

To unloc the !oor% +erely 6ush the 2utton #% The +agnet then !raws the ar+atureout of the screw eye an! the !oor is unloce!. The !otte! line at D shows the 6osition ofthe ar+ature when the circuit is co+6lete an! the !oor unloce!. The weight +ust 2e in

6ro6ortion to the strength of the +agnet. If it is not% the !oor will not

(uto+atic #lectric oc for Doors

loc% or woul! re+ain loce!. The 2utton can 2e hi!!en% as it is the ey to the loc. ==ontri2ute! 2y lau!e B. Melchior% Hutchinson% Minn.E9)e*$!e"t 3$t T3oFoot R4le "d H!!e* %&06'

(n e5a+6le of unsta2le euili2riu+ is shown in the acco+6anying setch. (ll that isnee!e! is a $=foot rule% a ha++er% a 6iece of string% an! a ta2le or 2ench. Thee56eri+ent wors 2est


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(n #56eri+ent in #uili2riu+

with a ha++er ha


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(uto+atic Ti+e Draft=,6ener

Ho3 to T*"-!$t Po"o#*) M4-$( to D$-t"(e %&07'

(n interesting e56eri+ent% an! one calculate! to +ystify anyone not in the secret% isto trans+it the +usic or s6eech fro+ a 6honogra6h to another 6art of the house ore


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Ho+e+a!e Telesco6e

fasten one glass on the to6 of it in the center 2y !ri


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Detail of Telesco6e onstruction

fro+ the 2lae will shine onto the glass. lace the s6eculu+ S% *ig. $% so the rays fro+the nee!le hole will 2e thrown to the left si!e of the la+6 :facing the s6eculu+;% withthe nife +ounte! in a 2loc of woo! an! e!geways to the la+6% as in F% *ig. $. Thenife shoul! not 2e +ore than ) in. fro+ the la+6. /ow +o


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are thrown to the eye6iece # in the si!e of the tu2e. Mae the tu2e I ofsheet iron% co


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Si+6le #lectric oc

it auto+atically locs. To unloc% 6ush the 2utton D% which act will cause theelectro+agnet to raise the latch % when the 2olt +ay 2e !rawn an! the !oor o6ene!. ==ontri2ute! 2y (. D. Pi++er+an% Boo!y% Ill.

Ho3 to M$9 Pl-te* o P*$- %&&0'

*or the +i5ing of 6laster of aris for any 6ur6ose% a!! the 6laster gra!ually to thewater% instea! of the contrary% says the Master ainter. Do not stir it% ust s6rinle it inuntil you ha


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Maing arge ictures with a S+all a+era

Po-$t$o"$"# A H"#$"# L!) %&&&'

DonCt 6ull a la+6 hung 2y fle5i2le cor! to one si!e with a wire an! then fasten to agas 6i6e. I ha


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Si+6le urrent=e


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(rc ight

L$#t$"# " I"("de-(e"t L!) 3$t " I"d4(t$o" Co$l %&&+'

(n incan!escent la+6 of low can!le6ower +ay 2e illu+inate! 2y connecting to anin!uction coil in the +anner shown in the setch. ,ne wire is connecte! to the +etalca6 of the la+6 an! the other wire is fastene! to the glass ti6. If the a66aratus is then

6lace! in the !ar an! the current turne! on% a 6eculiar 6hos6horescent glow will fillthe whole interior of the la+6. The in!uction coil use! for this 6ur6ose shoul! gi


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which woul! 2e 2etter to 2uy rea!y=+a!e. If the 2uil!er has ha! no e56erience in coil=win!ing it woul! 6ro2a2ly 6ay to 6urchase the secon!ary coil rea!y=woun!% as theo6eration of win!ing a +ile or +ore of fine wire is


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securely with 2an!s of 6a6er or ta6e% an! 2oile! in 6ure 6araffine wa5 for one hour%after which it is 6resse! un!er consi!era2le weight until fir+ an! har!. ,ne of the sheetsof tin=foil is to for+ one 6ole of the con!enser% an! the other sheet% which is insulate!fro+ the first% for+s the other 6ole or ter+inal. :This con!enser +aterial is 6urchasa2lein long stri6s% rea!y for asse+2ling.;

The wiring !iagra+% *ig. '% shows how the connections are +a!e. This +etho! ofconnecting is suita2le for all coils u6 to 1=1G$ in.s6ar% 2ut for larger coil 2etter resultswill 2e o2taine! 2y using an in!e6en!ent ty6e of interru6ter% in which a se6arate +agnetis use! to interru6t the circuit. Besi!es the +agnetic


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!ia+eter is 7 in.% an! then ri


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Fee6 the !i


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6hotogra6h 6lates an! 6ro!uces +any other curious che+ical changes.

N1l S)eed Re(o*d %&&6'

,n its official trial tri6 the British tor6e!o 2oat !estroyer NMohawN attaine! the recor!s6ee! of a little o


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Magnifie! /ine Dia+eters

close e5a+ination. hotogra6hs +a!e 2y 6hoto+icrogra6hy can 2e e5a+ine! lie anyother 6hotogra6hs an! show no +ore te5ture than will any 6rint.

Steel Pe" U-ed $" D*t-!";- I", Bottle Co*, %&&7'

( steel 6en +aes an i!eal su2stitute for a uill in the sto66er of the !rafts+anCs in2ottle. The a!


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attern for utting the Seg+ents

into 10 eual 6arts an! also !i


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ft. 2alloon are 1$L l2. of iron 2orings an! 1$L l2. of sul6huric aci!. 1 l2. of iron% 1 l2. ofsul6huric aci! an! l2. of water will +ae cu. ft. of gas in one hour. Secure twoe+6ty 2arrels of a2out L$ gal. ca6acity an! connect the+% as shown in *ig. L% with 'G=in. 6i6e. In the 2arrel% (% 6lace the iron 2orings an! fill one=half full of clear water. *illthe other 2arrel% B% with water $ in. a2o


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Eater 1 o.

re6are the solutions se6arately an! +i5 eual 6arts for use% at the ti+e of e+6loy+ent.Dry the 6lates in the !ar% an! ee6 in the !ar until use!. rinting is !one in the sun% an! a


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as 6ossi2le% e5ce6t for a2out 1 in. on each en!. ,ne en! of this tu2e is ha++ere! together asshown at ( in the setch to +ae a 6ocet to hol! the 6aste. This% of course% !oes not nee! to2e watertight.

( 2o5 of woo! is +a!e to hol! the larger tu2e or cu6. This 2o5 can 2e suare% an! thecorners left o6en aroun! the cu6 can 2e fille! with saw!ust. ( su66ort is now +a!e fro+ a2loc of woo! to hol! the tu2e% B% in 6lace an! to ee6 it fro+ touching the cu6 . This

su66ort or 2loc% D% is cut circular with the sa+e !ia+eter as the lea! cu6 . The lower6ortion of the 2loc is cut away so it will ust fit insi!e of the cu6 to for+ a sto66er. Thecenter of this 2loc is now 2ore! to +ae a hole the sa+e sie as the s+aller lea! 6i6e. lacethe lea! 6i6e in the hole an! i++erse it in s+oing hot 6araffine wa5% an! lea


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*its *our Different Sha6e! Holes

in *ig. 1. The holes in the !ifferent 6laces as shown in *ig. $% were fitte! 2y this one 6lug.

Ho3 to M,e L$#t"$"# A**e-te* %&++'

Secure a 6iece of woo! a2out '=1G$ in. suare that will furnish a nice finish an! roun! thecorners an! +ae a s+all roun!ing e!ge as shown in the setch. *ro+ a 6iece of 2rass 1G1)in. thic cut two 6ieces alie% ( an! B% an! +atch the+ together% lea


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#asy to Buil! an! Safe to se

Poto#*)e*-; P*$"t$"# F*!e St"d %&+/'

Ehen using !e


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The acco+6anying illustration is a re+ara2le 6hotogra6h of a strea of lightning. Manyinteresting 6ictures of this in! can 2e +a!e !uring a stor+ at night. The ca+era is set in a

6lace where it will not get wet an! left stan!ing with the shutter o6en an! the 6late rea!yfor the e56osure. Shoul! a lightning strea a66ear within the range of the lens it will 2e+a!e on the 6late% which can 2e !e


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the fiel!=+agnet% or Nstator.N /either co++utator nor sli6 rings are reuire!% an! alls6aring is a


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of the first an! fourth coils connect to the su66ly.The rotor is woun! with /o. $ !ou2le cotton=co


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a66ear in. a2out a +inute% an! !e


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The +aterial nee!e! for +aing this 6orch swing chair are two 6ieces of roun! woo! $=1G$ in. in !ia+eter an! $0 in. long% an! two 6ieces 1=1G in. in !ia+eter an! 0 in. long.These longer 6ieces can 2e +a!e suare% 2ut for a66earance it is 2est to ha


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The acco+6anying setch illustrates a


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Ho!eMde M$(*o!ete* %&/0'

It often 2eco+es necessary to fin! the thicness of +aterial so thin% or incon


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A"ote* Ele(t*$( L!) E9)e*$!e"t %&/&'

Brea a 6ortion of the en! off fro+ a 1)=c6. glo2e that has 2een thrown away as useless.Shae the glo2e until all the fila+ent is 2roen away% lea


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is a2out $=1G$ in. long. The ar+ature% (% is !rille!% +aing a hole ust a little larger than thero!% B% an! is a!uste! in 6lace 2y two set screws% D an! #. ( soft 6iece of iron% *% is fast=ene! to the o66osite en! of the ar+ature with a screw% which shoul! 2e 6lace! !irectlyun!er the en! of the coilCs core. This en! of the ar+ature +ay 2e e6t fro+ swingingaroun! 2y 6lacing it 2etween a =sha6e! 6iece of 2rass fastene! to the cross 6iece . (t the

2otto+ en! of the fra+e% an! !irectly centering the holes H an! J% a hole is !rille! torecei


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Sto1e )ol$- %&//'

Sto


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lace a s+all 6iece of 6a6er% lighte!% in an or!inary water glass. Ehile the 6a6er is

2urning turn the glass o


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AN ELECTRIC ILLUSION BO %&/5'

The acco+6anying engra


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*our #lectric Magic Bo5es o+6lete for se

the front% an! with the 6ro6er illu+ination one is change!% as it a66ears% into the other. Ehenusing as a win!ow !is6lay% 6lace the goo!s in one 6art an! the 6rice in the other. Many otherchanges can 2e +a!e at the will of the o6erator.

#lectric la+6s +ay 2e controlle! 2y


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Fee6s rints onstantly Mo


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Mechanical Ta2le Tal

of in!uction coils% a2out in. long an! 2ent in the for+ of a hoo at the lower en!% as shownat B. This wire is attache! to the 2loc of woo!% (% as shown in *ig. $. The en! of the wire issol!ere! to a s+all 2rass 6late which is set in the 2loc so it will 2e le


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It is well not to win! to the e5tre+e en!s of the 6a6er insulations% 2ut to lea


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as the other wires. This will lea


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Details of Battery

la+6% is o2taine! fro+ a !e


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of glass.=ontri2ute! 2y J.Thos. ha+stine.

Sote"$"# Lete* $" Glo1e- "d Boot- %&20'

The leather in high=to6 2oots an! gauntlet glo


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!escri6tion. *ig. 1 gi


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In *ig. ' is shown two


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the tan% is 6lace! i++e!iately ne5t to the en! of the tan% lea


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#lectric Massage

four cells of !ry 2attery connecte! to two or!inary sil


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Ho3 to M,e Led Pe"($l Reo-tt %&25'

Tae an or!inary lea! 6encil an! cut se


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to 2e use! on the can


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through the 6ieces for+ing the 2ase.The 2races are easiest +a!e 2y taing the two 6ieces which were 6lane! to 1=1G8 in.

thic an! ' in. suare an! !rawing a !iagonal on each. *in! the +i!!le of this !iagonal 2y!rawing the central 6ortion of the other !iagonal at this 6oint 6lace the s6ur of the 2it an!

2ore a 1=in. hole in each 2loc.Saw the two 2locs a6art% sawing

Details of onstruction of i2rary a+6 Stan!

along a !iagonal of each. lane the surfaces on the saw cut s+ooth an! san!6a6er the cur


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The o+6lete! a+6

cut out% the glass is inserte! fro+ the un!er si!e an! hel! in 6lace 2y s+all cli6s sol!ere! tothe fra+e of the sha!e.

leasing effects are o2taine! 2y using one in! of +etal% as 2rass% an! reinforcing an!ri


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Ill4!$"t$"# Wt( D$l t N$#t %&2:'

This 6icture shows a watch hol!er% with a !e


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6re


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cell of 2attery to the instru+ent an! allow the current to flow through the coils. Thenee!le of the co+6ass will 2e !eflecte! to one si!e or the other% an! will finally co+e torest at a certain angle=let us say L !eg. The !i+ensions of the instru+ent are such thatwhen the !eflection is L !eg. the current flowing through the coils u6on the ring is 1G$a+6ere. The a+6ere is the unit chosen to !esignate the strength of the electric current.*or other angles the


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lution a thin layer of erosene or 6araffin. The cell will only cost a2out L0 cents to +aean! $L cents for each renewal. Ehen renewing% always re+o


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( 6iece of iron 6lace! in a coil of wire carrying a current of electricity 2eco+es anelectro+agnet. If such a coil an! iron core 2e +a!e s+all enough they can 2e attache!to a cor an! the cor% floating on a solution% will allow the +agnet to 6oint north an!south. The setch shows how to +ae such an instru+ent. ( coil of insulate! wire iswra66e! aroun! a s+all iron core% lea


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1=in. 6iece of 1G=in. 2rass tu2ing% B% an! then sol!er on the co


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of the coil.The 6a6er can 2ecali2rate! 2y connecting one cell of 2attery to the 2in!ing=6osts. The

iron 6lunger% D% is !rawn into the tu2e an! conseuently the 6ointer% #% is !rawn nearer tothe coil. Mae a +ar !irectly un!er the 6lace where the 6ointer co+es to rest. (t the 6lace+ar the nu+2er of


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onstruction of 9eissler Tu2e

re+o


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9reasy sto


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,l! ulleys an! i6e *ittings

other% which connects all ar+s together on 2oth si!es of the wheel. Mounte! on the shaft withthe 6ulleys is a gui!e for the ite wire or string. The 6hotogra6h shows that this gui!e 6er+itsof 2eing +o


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This +i5ture is s6rea! o


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Ho3 to M,e SelSett$"# R$t T*) %&58'

Secure a goo!=sie! 2o5% say% 1 ft. high% 1=1G$ft. wi!e% an! ' ft. long an! to the2otto+% a2out 10 in. fro+ one en!% fasten a $=in. suare 6iece% (% *ig. 1% e5ten!ing thewi!th of the 2o5. lace a 10=in. 2oar! slo6ing fro+ the en! of the 2o5 to the cleat (.The swing !oor B% *ig. 1% is +a!e as shown

Self=Setting Tra6

in *ig. $% which re6resents the 2ac si!e of the !oor. Sheet +etal or tin is cut to the6ro6er sie an! tace! aroun! the e!ge of the hole. This 6re


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6ro6er 6lace to +ae a s+all hole.Ho!eMde >$t- o* te C!e* %&5:'

If you ha


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A Flot$"# Co!)-- Needle %&60'

Ehen a thoroughly !ry an! clean sewing nee!le is carefully 6lace! on the surface of waterthe nee!le will float e


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watertight rece6tacle. (ll sol!ering shoul! 2e !one on the outsi!e an! none of the sol!erallowe! to run on the insi!e of the sea+. (ll sea+s on the insi!e shoul! 2e 6ainte! withas6haltu+ in or!er to co


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S($e"t$$( E9)l"t$o" o To< %&6+'

In a recent Issue of o6ular Mechanics an article onNThe Turning ar! uleNwas !escri2e! an! illustrate!. ,utsi!e of the scientific si!e in


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sol! on the streets of our large cities +any years ago.This toy intereste! +e so +uch that I ha


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elli6tic +otion is re6eate! for each notch% an! the !irection of this +otion is the sa+ewhether the nail 2e ru22e! forwar! or 2ac. *or o2liue si!e 6ressure fro+ the right :notchesassu+e! u6war!;% the +otion of the stic an! hence of the re


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S6lashes fro+ a S6here In Mil an! Eater


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Ho3 to M,e St$(, P$" %&62'

( fine stic 6in or 2utton can 2e +a!e fro+ a new one=cent 6iece. arefully file out allthe +etal aroun! the In!ian hea! an! slightly roun! the e!ges. Sol!er a 6in to the 2ac of thehea! when it is to 2e use! for a stic 6in. If a collar 2utton 2ase is sol!ere! to the 2ac of thehea! instea! of the 6in it can 2e use! for a 2utton. These can 2e gol! 6late! 2y a eweler an!then you will ha


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2rass% as shown in *ig. $.The first 6iece% or +ain 6art of the fra+e% is +a!e fro+ 2rass% 'G in. wi!e an! 1)

in. long% 2ent into an o2long sha6e an! the en!s sol!ere! or 2olte! together. If theen!s are to 2e sol!ere!% 2efore !oing so !rill four 1G=in. holes 1 in. fro+ the en!s an!insert the en!s of the a5les. The other two 6ieces are 1G$=in. wi!e an! of the!i+ensions shown in the setch. These 6ieces are ri


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slowly !rawn through the o6ening in the center of the coil. ==ontri2ute! 2y (rthurie2en2erg% incinnati% ,.

Ho3 to M,e Po(,et S,te S*)e"e*R1))

Secure a suare file an! 2rea off a 6iece% *ig 1% the length of a 6a6er cli6% *ig. $. Drawthe te+6er in the en!s of this 6iece of file% 2ut !o not heat the center. This can 2e !one 2ywra66ing a wet 6iece ofcloth or as2estos aroun! the +i!!le an! hol!ing it in the aws of a

6air of tongs which will only lea


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2elongs to the sa+e corner it cannot 2e 6ulle! +uch without loosening the twiste! line ofthe not to 2eco+e a straight line. The other corner for+s a sli6 not on the en!% which can

2e !rawn out without !istur2ing the for+% or a66arent security of the not% at the +o+entwhen you co


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to run true. The fra+e hol!ing the +an!rel% gear 2lan an! cloc wheel is inserte! in thetool 6ost of the lathe an! a!uste! for !e6th of the cutter. The lathe is starte! an! the gear

2lan fe! on the cutter slowly until the tooth is cut. The 6awl is release! an! the +an!relturne! to the 6ro6er nu+2er of teeth an! the o6eration re6eate!. In this +anner gears ' in.in !ia+eter can 2e +a!e on a )=in. swing lathe. ==ontri2ute! 2y Sa+uel . Buner%Broolyn% /. -.

W$*e Te*!$"l- o* Btte*< Co""e(t$o"- %&68'

otter in Eire Ter+inal.

9oo! connections on the en! of wires for 2atteries can 2e +a!e fro+ cotter 6ins%*ig. 1% a2out 1=1G$ in. long. #ach en! of the wire is 6ut through the eye of a cotter 6in%twiste! aroun! itself an! sol!ere!. The connection an! eye are then co


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Ho3 to M,e S$!)le St$ll %&70'

( still to !istill water can 2e +a!e fro+ a test tu2e% so+e hea


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Distilling Eater

a sto66er for the test tu2e% an! 2ore a hole through the center% into which fit a s+all6iece of tu2e. The 2ottle is also fitte! with a sto66er containing a 6iece of tu2e% an!2oth 2ottle an! test tu2e connecte! with a ru22er tu2e.

The test tu2e is 6artly fille! with water an! su66orte! or hel! o


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cu66ing to hol! the +inerals an! each shoul! ha


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gently on his feet. ,f course% the 2eginner shoul! learn 2y taing short u+6s% gra!uallyincreasing the !istance as he gains sill an! e56erience in 2alancing an! lan!ing.

Details of the 9li!er

The 6ro6er 6osition of the 2o!y is slightly ahea! of the center of the 6lanes% 2ut this+ust 2e foun! 2y e56erience. The +achine shoul! not 2e use! in win!s 2lowing faster than1L +iles an hour. 9li!es are always +a!e against the win!% an! the 2alancing is !one 2y+o


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e5ercise! in +aing lan!ings otherwise the o6erator +ight suffer a s6raine! anle or6erha6s a 2roen li+2. The illustration shows two lines of flight fro+ a hillto6% the gli!ertra


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In!oor 6hotogra6hs are +a!e +uch 2etter with the use of a flashlight than 2y !e6en!ingon light fro+ win!ows. The lighting can 2e +a!e fro+ any !irection to suit the o6erator. Iflighting flash 6ow!er when not in a regular flash la+6 the flash cannot 2e !e6en!e! u6onan! in so+e instances is !angerous. To +ae a si+6le an! ine56ensi


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flash only striing one si!e of the 2all gi


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Ho3 to M,e Sel$"# W9 Ht P$"- %&75'

Select a stic of sealing wa5 of the !esire! color for the foun!ation of the hat 6in. Hol!

the en! of the stic o


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hinese Doing the 9ran! Ehirl

with their ar+s loce! a2out each other an! the two outsi!e 6ersons swinging in +i!airwith their 2o!ies al+ost horiontal.

Ho!eMde Poto#*) o L$#t"$"# Fl- %&76'

How +any ti+es has each a+ateur 6hotogra6her trie! to 6hotogra6h the lightningCs flashSo+e goo! 6ictures ha


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Details of a Ho+e+a!e Static Machine

to collecting co+2s attache! to !ischarging ro!s. The glass selecte! for the 6lates+ust 2e clear white glass% free fro+ wrinles% an! of a unifor+ thicness. Two 6latesare necessary to +ae this +achine% an! the glass shoul! 2e of sufficient sie to cut acircular 6late 1)=in. in !ia+eter. ( hole +ust 2e +a!e e5actly in the center of each

6late% an! this shoul! 2e !one 2efore cutting the circle. ,ne of the 2est ways to +ae

the hole is to !rill the glass with a


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are attache!. Brass 2alls are sol!ere! to the u66er en!s of the !ischarging ro!s% one ha


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is a goo! one. rocure a clear glass 2ottle an! stic a 6in in the lower en! of the cor.(ttach a threa! to the 6in an! tie a s+all weight to the en! of the threa! so it will hanginsi!e the 2ottle when the cor is in 6lace. Infor+ your au!ience that you will se


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an! 6encils% or cigar ashes% etc. They are easily +a!e% reuire no eui6+ent in the wayof tools e5ce6t what are usually foun! a2out the house% unless it woul! 2e the +etalshears% an! when the !ecorations are well !esigne! an! the +etal nicely colore!% they+ae attracti


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the roun!=nose! 6liers for this 6ur6ose.o66er is freuently treate! che+ically to gi


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calle! the u66er fingers an! each has a


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In the thir! nu+2ering to +ulti6ly a2o


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Illusions Shown2y e


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The #ngine Is (2out $0 Inches High

they ha! to 2e !rille! an! chi66e! out. The stea+ chest is roun!% as it ha! to 2e +a!e to fitthe roun! tee connection. The crosshea! runs in gui!es +a!e fro+ a 6iece of gas 6i6e withthe si!es cut out an! threa!s cut on 2oth en!s. ,ne en! is screwe! into a ri+ turne! on thecylin!er hea! an! the other is fitte! into an o2long 6late. Both en!s of this 6late were!rille! an! ta66e! to recei


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will cause the +etal to 2rea. To o


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stereosco6e. In the first 6lace there is

ooing Through the olore! 9elatine

only one 6icture% not two +ounte! si!e 2y si!e. The stereogra6h consists of a 6iece of car!%ha


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Me*(4*< M,e"dB*e, Co""e(t$o"- o* I"d4(t$o" Co$l- %&87'

In!uction coils o6erating on low


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nu+2ers is 1L l2. to the suare inch an! will su66ort a colu+n of water 1 in. suare% ' ft.high% or a colu+n of +ercury :!ensity 1'.); 1 in. suare% '0 in. high.The 6arts necessary to +ae a si+6le 2aro+eter are% a glass tu2e 1G8 in. internal !ia+eteran! a2out ' in. long% a 2ottle 1 in. insi!e !ia+eter an! $ in. high. Seal one en! of the tu2e

2y hol!ing it in the fla+e of a gas 2urner% which will soon soften the glass so it can 2e6inche! together with 6liers. ut a little 6araffin in the 2ottle an! +elt it 2y hol!ing the2ottle o


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Ho!eMde Po-t o* S3$"#$"# L$#t %&8:'

e+o


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osition of the Men

+o


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in. wi!e at the 2otto+% ta6ering in a straight line to a 6oint at the to6. These !i+ensionsallow for the lai! or la66e! sea+s% which shoul! 2e

(n Ine56ensi


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the s6aces aroun! the outline! figures% e5ce6ting the 1G=in. aroun! the outsi!e of the6attern. Ehen all the holes are 6unche!% re+o


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howe


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The Merry=9o=oun! o+6lete

each fitte! with a tee on the en! an! into this tee u6rights of 1G$=in. 6i6e in suita2lelengths are screwe!% an! also short lengths with a tee an! a5le for the )=in. wheel arefitte! in the un!er si!e of the tee. The u6rights at their u66er en!s are also fitte! with

tees an! each oine! to the center 6i6e with 1G$=in. 6i6e flattene! on the inner en! an!fastene! with 2olts to a flange.The 2otto+ 6art of the cloth co


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Te D$-))e*$"# Co$" %&:/'

This is an unco++on tric% entirely ho+e=+a!e an! yet the results are as startling asin +any of the 6rofessional trics. ( s+all 2aing=6ow!er can is e+6loye! to


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+ae a 6lace for the negati


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+ahogany. The lens to 2e use! as a 6roector will !eter+ine the sie of the 2o5 to so+ee5tent. The +easure+ents gi


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ost ar! antern o+6lete

2e colore! !ea! 2lac insi!e to cause no reflection.The reflectors are +a!e of sheet tin or nicel=6late! +etal 2ent to a cur


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with s+all stics% or sus6en!e! 2y a string. The chief 6oint is to see that no 6art of thewoo! is co


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A G- C""o" %&:7'

If you ha


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tae the han!iest one. Be sure that this is the right one.Ehen the han!erchief has 2een torn an! fol!e!% 6ut it un!er the glass% on a ta2le%

near a 6artition or curtain. The ta2le shoul! 2e +a!e with a hole cut through the to6 an!a s+all tra6 !oor fitte! snugly in the hole% so it will a66ear to 2e a 6art of the ta2le to6.This tra6 !oor is hinge! on the un!er si!e an! o6ens into the !rawer of the ta2le an! can

2e o6erate! 2y the 6erson 2ehin! the curtain who will re+o"ot %&:8'

This is a


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o+6lete! Sailing anoe

The +aterials necessary for the construction of a sailing canoe% as illustrate! in theengra


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Details of a Ho+e=Ma!e Sailing anoe

which shoul! 2e well soae! in water for se


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The ru!!er is +a!e as shown in *ig. 10 with a +o


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Boo!e*"#- "d Ho3 to M,e Te! %+0+'

( 2oo+erang is a wea6on in


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once% for+ing a !ou2le 6iece 1=1G$ ft. wi!e an! ' ft. long. Mae a !ou2le stitch allaroun! the e!ge% lea


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an! $=LG8 in. long. The lower e!ge of this tin shoul! 2e a2out 1G$ in. fro+ the s6in!le.The 6ointer is sol!ere! to the s6in!le 1Gin. fro+ one en!. (ll of these 6arts shoul! 2e

2rass with the e5ce6tion of the stri6 of tin. (nother stri6 of tin% the sa+e sie as thefirst% is sol!ere! to two 2rass wires as shown in *ig. . These wires shoul! 2e a2out 1in. long.

The s6in!le of the 6ointer swings freely 2etween two 2ars of 2rass% 9% 1G1) in.thic% 1Gin. wi!e an! $=1G$in. long. ( s+all hole is countersun in one of the 2ars torecei


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an! 6ut the euatorial on the surface with OII on the south en! of the line. Then set the6ointer D to the !eclination of the o2ect% say Venus at the !ate of o2ser


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The Eiring Diagra+


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O"e W< to Coo, F$- %+06'

,ne of the 2est an! easiest ways of cooing fish while out ca+6ing is tol! 2y acorres6on!ent of *orest an! Strea+. ( fire is 2uilt the sie for the a+ount of foo! to 2ecooe! an! the woo! allowe! to 2urn !own to a glowing +ass of coals an! ashes. Eashan! season your fish well an! then wra6 the+ u6 in clean% fresh grass% lea


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2ore! through the center an! a tool inserte! an! hel! for each cut 2y a setscrew. ( woo!+an!rel with a +etal shaft to turn in the centers of a lathe was +a!e to fit the 2ore!=outcylin!er. The cylin!er was then 6lace! on the +an!rel% fastene! with a6in an! threa!e!on 2oth en!s. *langes were ne5t +a!e fro+ cou6lings !iscar!e! fro+ an ol! horse=

6ower tu+2ling ro!% to fit on the threa!e! en!s of the cylin!er casting. Ehen theseflanges were tightly screwe! on the casting an! face! off s+ooth the whole 6resente!the a66earance of a large s6ool.

o+6lete Ho+e+a!e 9asoline #ngine

The 2ac cylin!er hea! was +a!e fro+ a 6iece of cast iron% a2out 1G$in. thic% turne!to the sa+e !ia+eter as the flanges% an! with a s+all 6roection to fit snugly insi!e thecylin!er 2ore. Two holes were then !rille! in this hea! an! ta66e! for 'G=in. 6i6e. Two

6ieces of 'G =in. 6i6e were fitte! to these holes so that% when they were turne! in% as+all 6art of the en! of each 6i6e 6roecte! on the insi!e of the cylin!er hea!. These

6ieces of 6i6e ser


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was erecte! in our 2ac yar! one afternoon% the +aterials 2eing furnishe! 2y anacco++o!ating lu+2er 6ile% an! a little un% an! it has 6ro


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arts of a hinese Fite

in a co+2at until one of their ites floate! away with a 2roen string% or was 6uncture!2y the swift !i


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string% often se


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Ma!e of Blac a+2ric

2e +a!e 2y anyone on a sewing +achine. Ten yar!s of 2lac ca+2ric or other 2lac

cloth an! a little ru2y fa2ric will 2e reuire!. Tae the ca+2ric an! fol! it into $=y!.lengths :*ig. 1; which will +ae fi


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a!s Ma!e of (s2estos

2etween where the e!ges of the as2estos sheets oin together. This will for+ a hingeso the two uarters +ay 2e fol!e! for 6utting away. Mae the other half circular !isin the sa+e way. If lea


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leather as

Design on the eather

often as necessary to ee6 it sufficiently +oist to wor well. Trace the o6enings for thehan!les% also lines (=9% H=B% an! #=9% 9=J% an! corres6on!ing lines on the other si!e.

e+o


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#lectro=Magnet Motor

+any ti+es when a 2oy an! can say that if carefully constructe! it will run with greaterra6i!ity than the +ore e56ensi


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e+o


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wi!est 6oint. The !i+ensions an! sha6e of each gore are shown in *ig. $.The 2alloon is +a!e u6 of 1' gores 6aste! together% using a2out 1G$=in. la6 on the

e!ges. (ny goo! 6aste will !o==one that is +a!e u6 of flour an! water well cooe! willser


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Two lines are !rawn 6arallel on the ice fro+ L0 to 100 ft. a6art an! 2locs of woo!are 6lace! e


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*ig. 1 Ea5e! Brass late


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u6on any 6articular o2ect. To +eet the situation I constructe! the

*ig. 1 *ig. $

Ma!e of a a+era Tri6o!

!e


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Tin an an! Bell arts

tin as shown in the setch. Mount the 2ell


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rocure a yellow 6ine 2loc ' in. thic an! 1$ in. suare. The +ore une


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( great +any 6ersons who ha


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that are to 2e use! to hol! the +etal to the 2oar! while 6oun!ing it. The !esign shown inthe 6icture is ) 2y 8 in. at the wi!est 6art an! has 6ro


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wall.i


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The Motor o+6lete

The !ust ca6 on the en! of the 6e!al was re+o


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This no


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e+o


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olling an Toy

lea!% as shown in *ig. '% allowing the two en!s to 2e free. The 6ieces of tin 2etween theholes (% *ig. 1% on 2oth to6 an! 2otto+% are turne! u6 as in *ig. % an! the en!s of the

2an!s loo6e! o


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Begin wor 2y +oistening the leather on the 2ac si!e with a s6onge or cloth.Moisten as +uch as you !are an! still not ha


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in the 2oar! into the 2ench to6. The screws shoul! 2e of a length suita2le to tae in the6iece to 2e wore!. ==ontri2ute! 2y (. M. ice% Syracuse% /ew -or.

C*do*d S)$*l T4*"ed < Het %++6'

( no


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screws. ountersin the hea!s of the screws so they will not 2e in the way of thehan!s when the


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1 )=in. try suare1 oilstone

/o.1% $ an! 00 san!6a6er.

Eor2ench o+6lete

Re)$*$"# Wo*" >"$e Blde %++8'

Ehen the 2la!e of a fa


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as rigi! a case as the cow sin. If calf sin is to 2e use!% secure a 6iece of +o!elingcalf. The e5tre+e wi!th of the case is $='G8 in. an! the length )=LG8 in. Two 6ieceswill 2e reuire! of this sie. ut on the !esign 2efore the two 6arts are sewe! together.*irst !raw the !esign on 6a6er% then 6re6are the leather. lace the leather on a s+allnon=a2sor2ent surface% such as co66er or 2rass% an! +oisten the 2ac si!e with as+uch water as it will tae an! still not show on the face si!e. Turn the leather% lay the!esign on the face% an! hol! it in 6lace while 2oth the outline an! !ecoration aretrace! on the surface with a 6encil or so+e tool that will +ae a shar6 line withouttearing the 6a6er.

(fter the outlines are trace!% go o


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Pol$-$"# Flt S4*(e- %++:'

The wor of finishing a nu+2er of 2rass castings with flat si!es was acco+6lishe! onan or!inary 6olishing wheel% fro+ which the first few layers of cloth were re+o


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D*$e* o* Foot3e* %++:'

( !rier for footwear can 2e rea!ily +a!e 2y a tinner% or anyone that can sha6e tin an!sol!er. The !rier consists of a 6i6e of sufficient length to enter the longest 2oot leg. Itsto6 is 2ent at right angles an! the other en! is ri


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Re!o1$"# G*e-e St$"- *o! te Le1e- o Boo, %+/0'

Ha66ening to get a grease s6ot on a 6age of a


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Hollo3G*$"d$"# I(e S,te- %+/&'

The acco+6anying setch illustrates a 6ractical +etho! of cla+6ing ice sates tohol! the+ for grin!ing the s+all arc of a circle so +uch !esire!.

The =sha6e! cla+6s are +a!e of 'G=in. soft steel with the o6ening ) in. !ee6 an!L in. high an! are 2olte! to a 2loc of woo!% $ in. thic% ) in. wi!e an! 1$ in. long. Thesate runner is a!uste! to the 6ro6er height 2y 1G$=in.. set an! thu+2screws. The 2loc

Sate unner *astene! in la+6

of woo! hol!ing the cla+6 an! sate can 2e 6ushe! along on the e+ery=wheel ta2le infront of the re


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Has the ines of a Bicycle

+are! D are !ou2le or in !u6licate% an! shoul! 2e 1G$ 2y 1=1G$ in.

oasting

The runners are sho! with iron an! are 6i


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to s6ell N( Merry hrist+asN or N( Ha66y /ew -ear.N (n #aster greeting +ay ha


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lacing the hecers

the+ in four 6iles of two +en each without o+itting to u+6 o


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face! u6% so as to conceal the coin an! e56ose the 2utton. Eith a uic +otion 2ringthe left han! un!er the right% sto6 uic an!

Maing the hangethe 2utton will go u6 the right=han! coat slee


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9enuine antiue swor!s an! ar+or% as use! 2y the nights an! sol!iers in the !ays ofol!% are


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with light stroes u6 an! !own se


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free fro+ the +ineral su2stances which are !e6osite! in the ra!iator% 6i6ing an! acets2y har! water.

S)*$"#.o*d o* S3$!!e*- %+/7'

( goo! s6ring2oar! a!!s +uch to the fun of swi++ing. The 2oar!s are generally+a!e so that the 6lan will 2en!% 2eing !resse! !own thin at one en! an! fastene!. Thethinness of the 6lan% or an insecure fastening% causes +any a 6lan to sna6 in two orco+e loose fro+ its fastenings in a short ti+e.

The acco+6anying setch shows the +etho! of constructing a s6ring2oar! that !oesnot !e6en! u6on the 2en!ing of the woo! for its s6ring. It is +a!e of a 6lan% $ in. thican! fro+ 1 to 1) ft. long% one en! of which is secure! with a hinge arrange+ent ha


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chisel will 2e nee!e! to cut the +etal to length a file to re!uce the en!s to sha6e% an! a6iece of e+ery 6a6er to s+ooth an! 6olish the en! of the tool so that it will not scar the+etal.

( s+all +etal 2o5 +ust 2e secure! to hol! the 6itch. The illustration shows an ironrece6tacle. The 6itch is 6re6are! 2y heating the following +aterials in these 6ro6ortions4

6itch% L l2. 6laster of aris% L l2. tallow% 1G$

Design for the *ra+e

l2. To 6ut it in another way% use 6itch an! 6laster in eual 6arts with 1G10 6art tallow.See that the 6itch an! 6laster are !ry so that the +oisture will not cause the 6itch to 2oilo


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s+ooth.lean the +etal thoroughly% using 6ow!ere! 6u+ice with lye. otton 2atting fastene!

to the en! of a stic will +ae a goo! 2rush. 6on the cleanse! +etal 6ut a lacuer to6re


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18 in. Dia+eter 1$ in. Dia+eter*ig. 1 *ig. $

*ig.' *ig.I

Bir!s an! *ish (66arently Together

lace the 2ir!s in the inner


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co66er of /o. $' gauge of a sie sufficient to +ae the 6ieces !etaile! in theacco+6anying setch. ( ri


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can 2e 6resse! 2ac an! le


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*I9.1 *I9.$

*orcing (ir Through Eater

I!$tt$o" A*!- "d A*!o*P*t II %+2+'

I+itation swor!s% stilettos an! 2attle=a5es% 6ut u6 as orna+ents% will loo well if theyare arrange! on a shiel! which is hung high u6 on a wall of a roo+ or hall% says the#nglish

*I9 1 *I9 $ *I9 '

Three *ifteenth entury Swor!s

Mechanic% on!on. The following !escri2e! ar+s are authentic !esigns of the originalarticles. ( 9er+an swor! of the fifteenth century is shown in *ig. 1. This swor! is ft.long with the crossguar! an! 2la!e of steel. The i+itation swor! is +a!e of woo! an!co


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re6resent co66er% the orna+entations can 2e 2uilt u6 of wire% string% s+all ro6e an!roun!=hea!e! nails% the whole finally ha


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!escri2e! in *ig. 10. Ehen the woo!wor is finishe! the han!le an! a5e are co


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*lower 9rows Instantly

Two 6ieces of wire are 2ent as shown in *ig. 1 an! 6ut together as in *ig. $. These wiresare 6ut in the ar% a2out one=thir! the way !own fro+ the to6% with the circle centrallylocate!. The wires can 2e hel! in 6lace 2y carefully 2en!ing the en!s% or using s+allwe!ges of woo!.

ut a wire shorter in length than the height of the ar an! tie a rose or se


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It has long 2een a 6ule to +e why roun! cornere! +ass are al+ost in


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#tching co66er is not a


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6lunge it into the aci! 2ath uicly.( green finish is o2taine! 2y 6ainting the 2acgroun! with an aci! stain co+6ose! as

follows4 1 6art a++onia +uriate ' 6arts a++onia car2onate $ 6arts water. If one coat !oesnot gi


305/596

I!$tt$o" A*!- "d A*!o* PART III %+28'

Maces an! 2attle=a5es 6atterne! after an! +a!e in i+itation of the ancient wea6onswhich were use! fro+ the

(ncient Eea6ons

fourteenth to the si5teenth century 6ro!uce fine orna+ents for the hall or !en% says the#nglish Mechanic. The i+itation articles are +a!e of woo!% the steel 6arts re6resente!

2y tinfoil stuc on with glue an! the orna+ents car


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orna+ental scrolls% lea


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Pl


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Ho3 to Re!o1e P)e* St4(, to Ne#t$1e %+50'

Ehen +aing 6hotogra6hic 6rints fro+ a negati


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2rightly% the other without a light. Me+2ers of the au!ience are allowe! to ins6ect2oth the ta2le an! the can!les.

The +agician wals o


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A Ho!eMde D"$ell Cell %+5+'

(n effecti


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station. The final a!ust+ent of an or!inary euatorial is


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a5is is a!uste! 2y turning these screws. #ach shaft% sa


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glass su2stitute4 Dissol


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are s6iral=s6herical s6rings co


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The Dog Has lenty of oo+ for #5ercise

wire 2etween the house an! 2arn on which is 6lace! a ring large enough to sli!e freely. Thechain fro+ the !ogCs collar is fastene! to the ring. This +etho! can also 2e use! for tetheringa cow or horse% the a!


316/596

A Pl"tFood Pe*(olto* %+58'

,2tain two 2utter tu2s an! 2ore a large nu+2er of 1G=in. holes in the 2otto+ of one%then co


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A D*$) S$eld o* te A*!- %+58'

Ehen woring with the han!s in a 6an of water% oil or other flui!% it is


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Three Stages of Eea


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shoul! 2e 6er+anently re+o


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tangent of the !egree of latitu!e. Draw the line (D% an! the angle B(D is the correct anglefor the style for the gi


321/596

L0 .L0 1.01 1.L' $.0) $.)8 '.$1 '.8$ .) L.1$ L.7& ).)LL .L 1.08 1.)' $.1& $.77 '.'7 '.&8 .)0 L.$ L.87 ).&60 .L7 1.1 1.71 $.'0 $.8& '.& .10 .7$ L.' L.&' ).L$

Ta2le /o. '

orrections in +inutes to change.Sun ti+e to local +ean ti+e = a!!

those +are! " su2tract thoseMare! = fro+ Sun!ial li+e.

Day of +onth 1 10 $0 '0January "' "7 "11 "1'

*e2ruary "1 "1 "1

March "1' "11 "8 "L(6ril " "$ =1 ='May =' = = ='June =' "1 "1 "'July "' "L ") ")(ugust ") "L "' "1Se6te+2er "0 =' =L =10,cto2er =10 =1' =1L =1)/o


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swor!s are !resse! !own an! finishe! with san!6a6er an! the steel 6arts re6resente! 2yco


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which is suare. The s6ear an! a5e is of steel with a han!le of 6lain !ar woo!. Theholes in the a5e can 2e 2ore! or 2urne! out with re!=hot iron ro!s% the holes 2eing a2out1Gin. in !ia+eter.

*igure shows an (ustrian officersC s6ontoon% use! a2out the se


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A" E!e*#e"(< B$tt Ldle %+62'

Tae an ol! sto


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2e of such +aterial% an! 6ut through in such +anner that they will not 2e rea!ily seen. If6a6er 2ea!s are use! they can 2e colore! to suit an! har!ene! 2y


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ta6e fro+ sticing to the car6et. ( swee6er treate! in this +anner will wor as well asa new one. ==ontri2ute! 2y E. H. Shay% /ew2urgh% /. -.

G4"tlet- o" Glo1e- %+66'

Ehen the fingers or 6al+s of glo


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2y a 6in or 2olt 6ut through the 2olt=hole of the 6lan an! into a hole in the wall. ==ontri2ute! 2y E. (. Jauythe% ich+on!% al.

(!usta2le latfor+

Cl-) o* Hold$"# Fle9$le L!) Co*d- %+67'

(


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Magnetic loc

forwar! an! 2acwar! instea! of laterally. The construction is


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To< G4" o* T*o3$"# C*do*d S=4*e- %+6:'

The 6arts of the gun are attache! to a thin 6iece of woo! 1 in. wi!e an! L in. long. Itis 2est to use a 6iece of woo! cut fro+ the si!e or co


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De


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lower strings. ==ontri2ute! 2y Thos. Deoof% 9ran! a6i!s% Michigan.

A" A$d $" S,et($"#R$70

Setching reuires so+e little training% 2ut with the a66aratus here illustrate! anine56erience! 6erson can o2tain e5cellent results. The a66aratus is +a!e of a 2o5 8 in.!ee6% 8 in. wi!e an! a2out 1 ft. long. ( !ou2le con


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nea!e!. ( large

Maing the lay Mo!el an! Three Hel+et Designs

Boar! or se


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as 6ossi2le. ut on a secon! layer of 6a6er as carefully as 2efore% then another coating ofglue% an! so on% until there are fro+ four to si5 coats of glue an! 6a6er. Ehen !ry% the

6a6er coating shoul! 2e uite stout an! strong enough for the hel+et to 2e use! fororna+ental 6ur6oses. Before taing it off the +o!el% which shoul! 2e no !ifficult +atter%owing to the clay 2eing oile!% tri+ off any ragge! e!ges of 6a6er with a shar6 nife% an!s+ooth an! finish all o


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sa+e sie l2. of fire clay two or!inary 2in!ing 6osts a2out 1 l2. of +ineral wool%or% if this cannot 2e o2taine!% thic sheet as2estos one o2long 6iece of woo!% 1 in.thic% 1$ in. wi!e an! 1L in. long one s+all switch one fuse 2loc a2out 80 ft. of

/o. $$ gauge resistance wire% 9er+an=sil


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or !rain tile an! win! the wire tightly aroun! it% allowing a s6ace 2etween each turn.The tile is then set on its si!e with a 2loc or 2ric un!er each en!. It shoul! not 2e seton en!% as the turns of the wires% when heate!% will sli6 an! co+e in contact with eachother% causing a short circuit. Ehen the tile is in 6lace% a short 6iece of fuse wire isfastene! to each of its two en!s. ( L=a+6ere fuse wire is a2out strong enough. ( con=nection is +a!e to these two wires fro+ an electric=light socet. The wire will get hot

2ut 6ro2a2ly re+ain the sa+e color. If this is the case% one of the fee! wires is!isconnecte! fro+ the fuse wire an! gra!ually +o


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So+eti+es the uices fro+ a hot 6ie +ae it stic to the 6an so tightly that a nife2la!e +ust 2e run un!er to cut it loose. If a nife with a fle5i2le 2la!e is not use!% the6ie will 2e !a+age!.

Se6arating ies fro+ ans

If the 6ie 6ans are 6ro


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a6er *unnel

6oint% o6en out% an! you ha


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the

Ma!e of a Bo5

chil! in the 2o5 an! to re+o


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ots *astene! to the Boar!

Lo(t$o" o G- Mete* %+77'

The gas +eter shoul! not 2e locate! in a war+ 6lace or the gas will e56an! 2eforethe +eter +easures it an! the gas 2ill will 2e 6ro6ortionately increase!. 9as e56an!s

2y a2out 1G&1 6art of its


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*ig. $=Designs for 9rills

!esire! nu+2er of turns an! when !ry% cut an! glue the+ together.

*ig. I=Metho! of *or+ing the o6e

In *ig. $% si5 !esigns are shown. These suggest i!eas in +aing u6 co+2inations or in6lain figures an! the nu+2er is li+ite! only 2y the ingenuity of the !esigner. ==ontri2ute! 2y 9eo. M. Harrer% oc6ort% /. -.

A S$!)le "d Ee(t$1e F$lte* %+78'


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rocure an or!inary la+6 chi+ney an! fit two or three thicnesses of cheese clotho


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+ain 6art of this ar+or is worn in front of the hea! the e5tre+e !e6th is a2out in. Theentire hea! 6iece +ust 2e +o!ele! in clay with the han!s% after which it is co


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con


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F$-$"# t*o4# I(e 3$t T$)U) %+8&'

The ti6=u6% use! for signaling the fisher+an when a fish is caught% is +a!e of a 1G=in.6ine 2oar!% a2out 1L in. long% $=1G$ in. wi!e at one en! an! narrowing !own to a2out 1in at the other. (t a 6oint ) in. fro+ the s+aller en!% the 2oar! shoul! 2e cut slightlywi!er an! a 1G$=in. hole 2ore! through it. Two or three wra66ings of fine co66er wire+ay 2e woun! aroun! the 2oar! on each si!e of the hole to gi


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Match Hol!er

acco+6anying setch. The sie +ay 2e +a!e to suit the taste of the worer. ( goo!sie is L in. wi!e 2y ) in. long o


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o


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#ach nail is woun! with three or four layers of fine insulate! +agnet wire% a2out /o.$L gauge% si+ilar to that use! in electric 2ells% lea


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*ull Suit of (r+or

In +aing u6 the


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of the larger holes in the stri6% *ig. $% al+ost any !esire! inclination of the ca+era can2e secure!.

The sa+e sort of si+6le a66aratus 2uilt slightly stronger% an! with as+all caster un!er each of the three series of s+all holes% +aes an

The Tri6o! annot Sli6

e5cellent tri6o! cla+6 for use when the ca+era has to 2e shifte! a2out% as in 6ortraiturean! the lie.

Ho3 to We1e Soe-t*$"# Wt( Fo %+85'

Ha


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*o2s Ma!e fro+ Shoestrings

the en!s of each alternate layer% always la6 one string% as at ( in *ig. '. o


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attern for the Ta2le Mat

as has 2een !escri2e! in se


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S$!)le "d Se Metod o* Se"d$"# Co$"- < M$l %+87'

Sen!ing coins 2y +ail is not as a rule a!


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I"-t"t"eo4- C*


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+ost effecti


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==ontri2ute! 2y Her2ert Hahn% hicago% Ill.

A S4-t$t4te o* Co!)-- %+8:'

(n easy way to +ae a 6encil co+6ass when one is not at han!% is to tae a nife withtwo 2la!es at one en!% o6en one to the full e5tent an! the other only halfway. Stic the

6oint en! of the fully o6en 2la!e into the si!e of a lea! 6encil an! use the half=o6en2

Documents

The Boy Mechanic Volume 1