[ 482 ] 
7765 
June 
h 3 
Times per I Apparent 
clock times 
Parts of 
the micro- 
meter 
/ // 
h t n 
43 37 
5 43 43 l 
45 ? 
45 5^1 
53— 
53 H 
55 — 
55 H 
59 ? 
59 21-2 
0 41 
6 0 4yi 
I 49 
^ 55 f 
3 3 ° 
3 3 ^ 
4 4 ^ 
4 46? 
6 55 
7 if 
8 IS 
8 2l| 
15 0 
IS I2| 
17 6 
17 I2| 
19 6 
19 I2 -I 
21 5 
21 1 
25 27 
25 33 
26 59 
27 I 
28 19 
28 25 
0 40 
7 0 45I 
0 43 
7 0 481 
18 56 
7 19 li 
19 IS 
7 19 2o| 
In- 
Ver- 
ches 
nier 
/ // 
0,15 
2 
0 s9,8 
0,10 
2 1 
I 1,5 
0,15 
2 
0 59,8 
4,60 
i 3 i 
51 34.8 
4,60 
14 
31 35.2. 
0,15 
4 
I 1.5 
0,10 
18 
0 59, J 
0,10 
2 1 
I 1.5 
0,50 
18 
3 36,6 
0 ,sO 
3 33.7 
0,50 
1 1 
3 30,8 
0,50 
9 
3 29. 2 
0.45 
15 
3 13.6 
0,4 s 
8 
3 7.9 
3.45 
I 
3 2,1 
0,40 
2 X 
2 58,0 
0,40 
6 
2 45,7 
0,40 
2 t 
2 42,4 
0,40 
0 : : 
2 40,8 
Micro- 
meter re- 
duced 
Obfervations on the Tranfit of Venus continued. 
? ’s diameter on the fcale 
Ditto ofr' 
Ditto on 
O’s horizontal diameter 
5 ’s diameter on the fcale 
Ditto olF 
Ditto ditto 
Dift. of $ ’s fartliell limb from the O’s nearcH 
Ditto 
J. D. 
Ditto 
Ditto 
Ditto 
Ditto 
Ditto 
Ditto 
Ditto 
Ditto ] , 
Di.<o I ^ 
The thread of light broke at the internal contadl 
Ditto 
The external contadf 1 
W.W. 
J 
Ditto 
I very hazy, and the limbs badly defined 
REMARKS. 
} 
W. W. 
J- D. 
w. w. 
J. D. 
1. All the meafurements of Venus's diameter; ard alfo all thofe of the Sun, which are not faid to be horizon- 
tal, were taken with the micrometer, in the fame diredlion that the laft preceding diftance of the limbs of V'enus 
and the Sun was meafured with. 
2. We were obliged to alter the rack-work of the mierrmeter before we began to meafure any diflances of the 
limbs, &c. in o.der to make it take in the diameter of Venus, off the fcale. 
3. The heavens at the beginning, and for a confiderable time both before and after, were frequently obfeured 
by clouds: bet in the intervals, the air was very clear, and the Sun’s limbs extreamely well defined. 
4. Soon after Venus was half immerged, a bright crcfccnt, or rim of light, encompafled all that part of her 
circumference which was off the Sun ; thereby rendering her whole periphery vifible. This continued very 
bright until within a few minutes of the internal contadf, and then vaniflied away gradually. 
We took for the inflant of the firft internal conta^, the time when the lealt vifible thread of light appeared 
behind the fulfequent limb of Venus ; but before that time, Venus’s limb feemed within that of the Sun, and 
his limb appeared beliind hers in two very obtufe points, feeining as if they would run together in a broad (Iream 
like two drops of oil ; but which ncverthelefs did not happen, but joined in a very fine thread, at fome dilfance 
fromthe exterior limb of Venus. 'I'his appearance was mucli moic confiderable at the egrefs than at the ingrefs ; 
owing, as we apprehend, to the bad date of the air at that t me. We took for the inllant of internal contad at 
the egrefs, the time when the thread of light difappeared before the prccecding limb of the planet, from which 
lime VV. W. took notice that he had told about 24" when the limbs of the Sun and Venus were apparently 
in contaft : a circunifiance which he did not venture to attend to at the ingrefs. 
6. V/e law nothing like the appearance of an ctmolphcrc round Venus (uniefs the above-mentioned phenomena 
may be thought to proceed from thence) either at the beginning, end, or during the time of the tranfit; nor 
could we fee any thing of a fiitelJite; though we looked for it fcveral times. 
7, It may nor be improper to add, that the hazinefs, complained of at the egrefs, was not owing to any acci- 
dental bad ijuality of the air at that time; it is continually fb here to 1 0° or r 2'’ above the horizon, and often 
even to 16° or iS", in what may be called the cleared date of the heavens. 
Obfervations 
