[ 173 ] 
feet, made by Mr. Dollond, with a treble objedt- 
glafs, magnifying 1 50 times ; and at 7^ 7' 49"i. 
apparent time, was certain that the planet had fen- 
hbly advanced upon the Sun’s difk, having feen a 
fmall impreffion upon the zenith part of the Sun’s 
limb near a minute fooner. At 7^ 23' 13'' mean 
time, or 7^ 25' 28''^ apparent time (as reduced from 
fidereal time), his Lordihip determined the internal 
contad, which he judged to happen when the dark 
penumbra, which was fo fenfibly perceived between 
the limbs pf the Sun and Planet, was loft upon the 
completion of the thread of light. His Lordfhip 
obferved at a fmall diftance from the obfervatory, by 
means of a flop-watch, which was let go at the in- 
flant he judged the total ingrefs to happen, and im- 
mediately compared with the obfervatory clock. 
Mr. Bartlett, a very excellent obferver, who has 
been conflantly employed in the obfervatory for many 
years, obferved with a 1 4 feet refrador on the north 
fide of the obfervatory, within hearing of the clock, 
die feconds of which were counted by Mr. Phelps, 
the other affiflant obferver. At 7^ 7' 4'' apparent 
time, Mr. Bartlett firft faw Venus upon the Sun ; 
and at 23' 10 '% mean time, or 25' 26 '^ ap- 
parent time, he judged the ingrefs to happen, the te- 
lefcope magnifying near 60 times. 
Lady Macclesheld was alfo pleafed to attend to the- 
obfervation s and at 7^ 25' j 6''4- apparent time, 
judged the fecond internal contadl to happen, with a 
refrading telefcope of 6 feet, through which the 
before mentioned was hardly to be di- 
The. 
penumbra 
liinguifhed 
