An Account of the Same Transit; By the Reverend Mr. Richard Haydon: In a Letter to JohnBevis, M. D.Author(s): Richard HaydonSource: Philosophical Transactions (1683-1775), Vol. 52 (1761 - 1762), pp. 202-208Published by: The Royal SocietyStable URL: http://www.jstor.org/stable/105614 .

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XXXVII Xw%Xcaut sf tk#J>me Sratrt; by the Rserend Mo. Richard Haydon: Ix a Letter to John Bevis, M. D

to tbe Revarend Thomas Birch, D. D. 5ary to tbe Roal 506Zety.

Dear Sit, Read Not. IX, T Send you inclofeds the Rnd Mn

'76 t Haydorx's obSemation of the late tranfxt

of Venus; and {hould:have waited on you with lt long

cre now, as I promifed) but that I unluckily gs a falls

which ftlll confines me at home. I prefiume this obSer- wation may deServe the notice of te Society, as the beR

sircumfl;anced of any I have yet feen made in England:

for fieveral of the phafes are earlier than thoDe at C;reen

wich, or ours at Savile-Houfe, taken with a telefcope of Mr Shatss, armed with Mrv Dollond's new mi-

srometer, and his time accurately aficestaned.

Dear Sirs

Your moll obedierlt

and affedionate

Clerkenvell-Ctofex humble fervant, Nov. 1Zv s761. Jv Bevis

By many comparifons of differerlt oSfervations, I

make Mr. Haydon>$ latxtaldve to be 5Q° 26' 55">

a;nd his longitude weR of Lond;on in time, 1 6 m-

nutes X o feconds nearly; though he, from a [ne-

morandum he made fome years agqj fiuppofed st

near twe minutes re

s ' fi

[ 202 ]

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t 3ohn Bevis DSor of Pb^e

S I R, Ldkeardg June 9, 1t:76fo

I Should, with great plea§uxe, have purfued, in evegr particular, the method you recommenfded to m¢,

in obServing the late tranfit of Venus, but, unfor_ tulaately, had it nu in my power to do fo. The low fittation of my houSe, and a fmall hill at a diilance to the N. E. of ir, would not allow me, eSven from nMt garret windows) Q vsew of ie fun, till it was I I° CK 12° above the horixon. By thw means, I was de- prived of an opportunity of making two of the prin- cipal obServatxons. It was almoR half an hour afier fiveX wk¢n I could firS ge a {ight d ffie fun. I was n hopos, from what you had wrote me, thtt the planet had not at that timc Xed itS nearek ditincr from the cerlte; but had foon the vexation to find mySelf difappointed. I, however, xntinued to ob- Sferve the diRance of Vellus fr the limb of the funs >'itll as much accuracy as I could, an ount d 87vhich you have on the next leaf. I think there can- not be an error <3f xrrre than two or three fecollds in tthe time of the interior mntaft, and not one of the tQai egrefsW

It was but two days befiore I received the fatur of your letter, that I came down Rairs for the £SR time, Xaker a fix weelis fevere fit of tile goutF During my ilineis, my clock W&S run dowfn-> a4nd fiopt. I im- nzediately iet it going again, as ne?rly to the time as I could then gueisX The next d<lV, being the firR of this month, at night I obServed the tranfit of a Ilar over the horiz;ontal hair in thc telcEcope of my

Dd 4 quadrant

L 203 J

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[ 2°4 ] quadrant. The third dayX I repeated the fame, and again lalE night: by which you will fee my clock meafures time correEtly enough. Thurfday) the 4th, was very hot and fultry all day; the evening, hazy an-d foggy. Fearlng the night following might prove the fanwe (as it unluckily did), and tlsat I Iould not be -able to take the equal altitudes of any of the Ilars before arld after they had paXed the meridian, I ob ferved, on Friday, leveral correfpondent altitudes cf tlle upper limb czf the liun, in the morning and after noon; by which the time may be precifely enough aScertairled. At the bottom) I trouble you with an account of thefie obServations, as alfio of fome made the day following.

It gives me mllch concern, that I carlnot herein anfwer your expe&ations, in a more perfedc and Iatif- faEtory manner; but, I aIFure youJ S;r,- I did every thing in my power for that purpoSe, and Ihould moIt readily embrace any opportunity of teRifying the re- fped I ow-e you. I beg you'll prefent my compliments to k Short; and am)

S I R, &c.

R. Haydonv

Correl--

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- - - -

[ 2°5 ] altitudes of tlle upper limb of the fun9 June the sths I76I

Correfpondent

Altitude. P. M A. M

7 o

o

56 o

h

At 6 6 7 7

8

5t 57 35

44 49

42 9

IO

25

532 35 2 W

h t tt

3 27 34 5 22 ; 4 44 4 37 S Cloudy

24

25

I

S

4T

2

By the aboves +9 34 -

my clock tx fak in apparent tlme

June 6th, upper limb of the fun

Altitude. A. M. P M

Q + h t tt

41 24 At 8 4o 57 42 40 8 49 I3 44 lo - 8 59 o

By theS, clock too faS 9t 4Ot'0

3 38 38 3 30 13 3 so 2o

June

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By my clock. __

h / ,, I At 5 34 54

S 53 o

l - w - E

31lne 6tbX x76X-. Angulttr value}

Inch. To.Pts. I 1

r)iameterof o _ 3 zo.3 t 3Ig

Diameter of e : - o io.o - - ° S9 °

Neare{} di0ance of Venes firom the limb d the funO N. B. The diameter of Venus is included-*

Micromet. Angular val-lle.

Obf.

2.

| t /R

5 5 I .6 1 Sem;diameter of Viens > to be deduded for the 5 38 t 7 j path of the center.

Obfo 4s I 23

45

L aob 3

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[ 207 3 y my clock.>Micromet. Angular talus

_ _ _

QbE b 8 t t {J

3* At 6 I3 245 5 I7 5 5tt1 4* 6 3 f 2445 0 I3 4 40.8 lsietofVcat sto be dedudked for tht 5- 6 54 54 o 4 22+4 22.o |paffiofffiecento 6- 7 28 {9 o 3 3 3 o.5J

S Io o Internal conta&. 8 29 3 Total egreIO.

Star croS the hazr of my telefcopea Ac.

Alt'Itude*' - - .

.. _ .

o o h R or h t rt h t t.t

rZs 4oI° 35 6 mSIO 27 x* rCloudyv < 25 0 TO 39 I9 9 < IO 31 2 s < Cloudy.

,_,t24 oso 43 24atIt 35 36-tto 5 53

it. B. Mr. Haydon informs me, in a libSequent lett, thae ' on comparing hgs obServatzons

with thic made sn London, lwls interval be 4-*- tween the inter-nal contadt and total egrelis

t was confiderably longer than-- any of the *s others. Wherefore, he examined his notes s again, but could not find Vhe had made any- ss miA:ake in tranlcribing them.'} Ile addsX that i£ beng oblid to obServe from an upper *s wirkdow his rgulatc being fised bdosr, 4 but urithln hearing} he got a lad} of aSout ** isytten} w}iom he Rridly chargi to is ' parfcutarly attmtive to ie *cond iMotn bti

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[ 208 ] ig thc clock, svhenever he fhould call to- him ̂ cc m which reEpeft, he is of oplnion, he made " no miIlake, though, pofl lbly, he might nlake sc one with regard to the minute, by fetting down " one too many at the egleSs; which he now Z thinks there is fome cauSe to believe he did."

J. B. , _ _

XXXVIII. ObWertation£ on the vme trant; and or vx EclipJ4e of the Moon, May 8, x76 I; and of the Sgn, on the 3d of June

I76I: Ir a Letter to the Rev. Thomas 33irch, D D. Secretary to the Royal So- siety, from Mr. Peter Wargentin, Secretary to he R.oyv/Mcadegy of Scieaaes ir Swederl, sxd F. R. 5.

RFad Nov. I2, T lttera hiSce inclufx, ad te et clarif 1761* tj filnum Dollondium fcripta, quas

amicus meus, Dominus Klingenllierna ( principis Suec. hareditarii praceptor) tranfmittendas mihi tra- didit, occaf1onem mihi fiuppeditant) paucis te invi- fiendi, tibique communicandi obServationes nonnullas aRronomicas, nuper a nze habitas, in obrervatorio Stockholmienfi, cujus elevatio poli eI} 59o so' 3IJ'} differentia autem meridian. ab obServatorio Greno- Vicenfi Ih I 2t I .

Si illas dignas judicaveris, qua illulErifl lma Socie tati Regia offeraxlturj erit id mihi gratiElmum, Xd-

quid

[ 208 ] ig thc clock, svhenever he fhould call to- him ̂ cc m which reEpeft, he is of oplnion, he made " no miIlake, though, pofl lbly, he might nlake sc one with regard to the minute, by fetting down " one too many at the egleSs; which he now Z thinks there is fome cauSe to believe he did."

J. B. , _ _

XXXVIII. ObWertation£ on the vme trant; and or vx EclipJ4e of the Moon, May 8, x76 I; and of the Sgn, on the 3d of June

I76I: Ir a Letter to the Rev. Thomas 33irch, D D. Secretary to the Royal So- siety, from Mr. Peter Wargentin, Secretary to he R.oyv/Mcadegy of Scieaaes ir Swederl, sxd F. R. 5.

RFad Nov. I2, T lttera hiSce inclufx, ad te et clarif 1761* tj filnum Dollondium fcripta, quas

amicus meus, Dominus Klingenllierna ( principis Suec. hareditarii praceptor) tranfmittendas mihi tra- didit, occaf1onem mihi fiuppeditant) paucis te invi- fiendi, tibique communicandi obServationes nonnullas aRronomicas, nuper a nze habitas, in obrervatorio Stockholmienfi, cujus elevatio poli eI} 59o so' 3IJ'} differentia autem meridian. ab obServatorio Greno- Vicenfi Ih I 2t I .

Si illas dignas judicaveris, qua illulErifl lma Socie tati Regia offeraxlturj erit id mihi gratiElmum, Xd-

quid

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