118 ASTRONOMICAL AND 
fervation of the laft external conta& Mr. Winthrop fuppofes 
was attended with the greateft certainty : And he noted thofe 
optical phono which have been mentioned. 
Mr. Paine's obfervation. 
Mr. Paine ufed a reflector made by Nairze,. magnifying 50 
times. This telefcope is fitted with vertical and horizontal. 
hairs ; and is fo made that thefe hairs may be adjufted to any: 
fituation ; to obferve differences. of altitude and azimuth, or- 
thofe of right afcenfion and declination... 
By his obfervation, the firft-external conta& was at 10% 77 
The internal contact: was notaccurately noted.. — - 
During the tranfit, he made the following obirin of the- 
difference of ri ight afcenfion between the limbs of the fun and 
Mercury : The hairs in the focus of the: reflector being fo. 
placed that the upper limb of the fun appeared to move along 
. the other was apron to: 
one hair, and of confequence, 
a $ 
preceding limb at the hair, Tu TOI TOP 
Mortar s center at the fame,. 27.39 | 
Sun's —— limb at the fame, | 28 6. 
E-—— ibaa dudit P She : Toi 32 49 
Mercury’s center at the fame, — 34 32d: 
pen eren ligh at the fme; * -o e 
Pur peeing inb at der, LIO 48 36 
sreury’s cente pipe p 50. 13; 
S> 43 
Sun's 
