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[ *79 3 
and another refle&or of i feet focus, with an achro- 
mic objedt-glafs micrometer of 40 feet focus, being 
the fame fort of indrument with thofe that were 
made, by order of the Royal Society, for Dr. Brad- 
ley, at the Royal Gbfervatory at Greenwich ; and for 
Mr. Mafkelyne, who went to St. Helena ; and Mr. 
Mafon, who went to Bencoolen; differing in one 
particular from their indruments, which had only a 
common objedt-glafs micrometer. 
I intended to have meafured the didance of Venus 
from each limb of the fun, in chords parallel to the 
plane of the equator, and in chords parallel to the 
horizon, and alfo to have taken the appulfes of the 
limbs of the fun and Venus to a vertical and horizon- 
tal wire, and had all the apparatus neceffary for thofe 
obfervations ; but the cloudinefs of the morning pre- 
vented my putting any of thofe methods into practice, 
for the clouds continued fo clofe, that we had no 
fight of the fun, till a quarter of an hour before fix 
o’clock, when, through an opening, which laded 
for about two minutes, Dr. Blair, Dr. Bevis, and I, 
plainly and didin&ly faw Venus on the fun, and 
concluded, that fhe was then confiderably pad the 
middle of her trandt. About a quarter after fix, I 
made the fird obfervation, which was, in meafuring 
the diameter of Venus; and foon after, I meafured 
her didance from the fun’s limb, in the direction of 
a line going through the fun’s center ; and fo con- 
tinued meafuring in the fame manner, and fometimes 
meafuring the diameter of Venus, till near the inter- 
nal contadl; only about a quarter after feven, I mea- 
fured the didance of Venus from the fun’s limb, in 
A a 2 a dip- 
