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SCIENCE-ADVERTISEMENTS
PHYSICS (particularly "Electronics") Professor, Ph.D.Formerly
head of department of physics at well-knownUniversity. Now Director
of research and developmentlaboratory of prominent electrical
manufacturer at goodsalary. Desires to return to University
professorship orresearch fellowship at University to study problems
in ay;plied physics and electronics for industrial concern.widely
known for his numerous successful electrical patentsand technical
papers. Desire for academic environment onlyreason for change.
Address "X," c/o SCIENCE, 3941 GrandCentral Terminal, New York, N.
Y.
STOP WATCH REPAIR SERVICESpecialists in repairing ALL MAKES.
Work fullyguaranteed. Money refunded if not satisfied.Send by
parcel post or express for FREE estimate. Nostrings, charge or
obligation attached to this offer.
Write for free catalogue No. 12of 40 types of "MEYLAN" stop
watches.
A. R. & J. E. MEYLAN, Dept. R268 West 40th StreetNew York
City, N. Y.
Contain All Essentials for GoodProduction and Growth
pURINA LABORATORY CHOWS have Forbeen developed and improved
Rats-Mice
through hundreds of feeding tests.They are carefully constituted
to sup- Dogs-Catsply all nutritional factors necessary
GuineaPigsfor prolific reproduction, and quick Rabbitsgrowth of
young (except vitamin C Monkeysfor guinea pigs and monkeys). The
Poultrygood results obtained with stock col-onies account in a
large measure forthe use of Purina Laboratory Chowsin more than 300
laboratories.
Sample and Literature on requestPURINA MILLS fns
86I Checkerboard Sq., St. Louis, Mo.
15
WANTED-An assistant in compiling a scientificbiographical
directory and for otherscientific editing. Must be ready tolive in
New York, Garrison, N. Y., orLancaster, Pa. State education,
ex-perience and salary expected. Ad-dress (by letter only) The
SciencePress, Grand Central Terminal, NewYork City.
BIOLOGISTSHEAVY WATER IS NOT EXPENSIVE!
$1.25 per gram in 25 gm. lots, 99.5% pureDo you wish to know
more about
HEAVY WATER-LIGHT WATER-HEAVY FATSJust drop us a line . . . as
the only com-mercial manufacturers of deuterium and itscompounds in
the United States, we'll beable to help you.
STUART OXYGEN CO.211 Bay St. San Francisco, Calif.
LaMOTTE Blood Urea OutfitFor study of urea retention
(urea nitrogen by factor).Result is read directly from
special Urea Burette supplied.No calculations required.Accurate
to 4 mg. urea per 100
cc. blood.Complete estimation takes only
15 to 20 minutes.Price, complete with instruc-
tions, $18.50 f.o.b. Baltimore,Md.LaMOTTE CHEMICAL
PRODUCTS CO.418 Light Street . . . . . Baltimore, Md.
THE SCIENCE PRESS PRINTING CO.PRINTERS OF
SCIENTIFIC AND EDUCATIONAL JOURNALS,MONOGRAPHS AND BOOKS
Correapondence InvitedLANCASTER, PENNSYLVANIA
I
MARCH 6, 1936
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SCIENCE-ADVERTISEMENTS
Have You Seen the BEAVER?This modern dissecting knife con-
sists of two simple parts: a replaceableblade, of surgical
grade; a stout handleof stainless steel.
Those parts ingeniously interlock toprovide all the rigidity of
a one-piecetool. Yet the blade can be changedin two seconds.
Beaver Blades . . . of differentshapes . . . have the keenest
edgeknown to surgical steel.
If you would like to tryTRIAL SET this knife, send for setSENT
ON No. 121S, including han-dUe, dummy blade, andAPPROVAL packet of
six assorted
blades.Postpaid for $1.75.
Use any or all of the blades withour compliments. If you are
notenthusiastic, return the handle forfull credit.
CAMBOSCO SCIENTIFIC COMPANYBox S WAVERLEY, MASS. U. S. A.
|)he CARVERLABORATORY PRESS
STANDARD EQUIPMENTfor
CHEMICAL
BIOLOGICALand
PHYSICAL
LABORATORIES
'Write for cataloggiving details of itsnumerous applica-
tions.
FRED S. CARVER
Hydraulic EquipmentE8t. 1912
S; 341 Hudson St., New York
No. 10 Analytical Balance
HENRY TROEMNERThe Standard of Excellence for 95 years.
Manufacturers of the highest grade Analytical,Assay and Pulp
Balances and Weights of Pre-cision.
Catalog 1929S
911 Arch StreetPhiladelphia, Pa.
LOVETT GARCEAUConsulting Engineer
ELECTRO-MEDICALLABORATORYDIAMOND HILLRHODE ISLAND
ThermoregulatorsWe announce the design of an ultra-sensi-tive
vacuum tube thermoregulator unit.Because of the infinitestimal
current passedthrough the mercury contacts, the relayis sensitive
to microscopic changes in theheight of the column. The unit will
oper-ate without circuit changes on 115 voltsdirect or alternating
current. By meansof a single change in connections, it maybe used
to control a cooling unit instead ofa heater. Power up to 800 watts
may beaccurately controlled.
Special Equipment Designedand Manufactured
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VOL. 83, NO. 2149
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MARCH 6, 1936 SCIENCE-ADVERTISEMENTS 17
CATH ETOM ETERThis Cathetometer is designed to meet the demands
for
a less expensive instrument, of one meter vertical range,for
accurate and general Laboratory work. The guide con-sists of a
substantial brass bar on which is divided the scalein millimeters.
The vernier reads to 0.05 mm.
The reading telescope is fitted with an achromatic objec-tive of
25 mm dia. with 600 crosshairs and is focused byrack and pinion.
With the extra objective draw tubewhich is supplied, the telescope
will focus from 60 cm toinfinity. The telescope carriage is
provided with a levelvial and delicate tilt adjustment.
The telescope and guide rotates on a strong verticalsupport rod
and can be clamped in any position, and theinstrument is supported
on a heavy tripod base with levelingscrews and foot plates . . . .
. . . . . $225.00
THE GAERTNER1204 WRIGHTWOOD AVE.
SCIENTIFIC CORP.CHICAGO, U. S. A.
Eastman Organic ChemicaslsFOR RESEARCH-save time by eliminating
thenecessity of preparing intermediates.
FOR ANALYSIS-increase speed, convenience,and accuracy of
determinations.
FOR INDUSTRY-offer highest quality to the in-dustrial user.
Nearly 3,000 different chemicals are listed in theEastman
Organic Chemical Catalog, a copy of whichwill be promptly forwarded
upon request.
EASTMAN KODAK COMPANYChemical Sales Division Rochester, N.
Y.
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M908
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MARCH 6, 1936 SCIENCE-ADVERTISEMENTS 17
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SCIENCE-ADVERTISEMENTS
ZEISSACCESSOR I ES
for Dark Ground
Illumination by
Incident Light
Micro Catalog 476 describes this andother new equipment for the
exami-nation of objects by reflected light.
EPI CONDENSERW
With triple revolving nosepiece, bright and darkfield
illuminating device, azimuth diaphragms,color filters, three 8-volt
lamp bulbs .....$51.00Achromatic Objective 5.3 n.a. 0.14 with
concave mirror 1 $20.00
di "6 9 n.a. 0.30 " " " 2 29.50"6 di 30 n.a. 0.75 " " " 3
43.50
$144.00
Prices f.o.b. N. Y.
CARL ZEISS, INC.485 Fifth Avenue 728 So. Hill StreetN E W Y 0 R
K IL- ,LOS A N G E L E S
JLN s' I
VOL. 83, NO. 2149
