< [ 3.12 ] 
the efteds of the atmorphere of Venus on the 
“ Sun’s limb wholly diiappeared, leaving that part 
“ of the limb as well defined as the -rcih From* 
this 1 concluded, tliat I had given the fignal too 
“ foon 5 and the times given by the other obfervers 
“ confirm me in this opinion.” 
Mr. Lukens’s Account of the Contacts. 
“ The telefcope 1 ufed, being a refrading one of 
“ 42 feet, giving but a fmall field, and fomething 
“ difficult to manage ; I was obliged to move often, 
“ and apprehend that 1 did not difeover the firil: 
external contact exadly. For, after one of thofe 
“ movements, on bringing the glafs to bear again on 
“ that part of the Sun’s limb where Venus was ex- 
“ peded, I faw a large tremulous fiiadow, already 
Ibmewhat advanced, and Teeming to prefs fiill in- 
“ wards on the Sun’s limb. Having contemplated 
this for a few feconds, and perceiving the appear- 
ance grow more dark, and make a better- defined 
“ impreffion on the limb, I gave the fignal to the 
“ perfons who counted time for me, which they 
“ noted'down feparately at 2'’ 12' 3" by the clock. 
“ When Venus was near one half her diameter 
“ advanced on the Sun, I faw a border of light en- 
“ compaffing that^part of her which was yet off the 
“ Sun. This was fo bright, that it rendered that 
“ part of Venus vifible, and pretty well defined, al- 
though off the Sun. But, towards the internal 
con tad. 
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