MATHEMATICAL; PAPERS. 15$ 
The fame clock and quadrant were made ufe of in this ob» 
fervation, which had been ufed for the obfervation of the folar 
.clipíe. The going of. the clock was, however,’ a little aif 
ferent, :becaufe it vn been altered. 
ILLUSTRATIONS OF THE OBSERVATION OF THE SOLAR 
ECLIPSE, 
The clock which was made ufe of to obtain ihe times, had 
à compound pendulum-rod, made by Monf. Berthoud, a cele- 
brated clock-maker át Paris.. It was regulated many days be- 
fore and after the obfervation, by correfponding altitudes, taken 
with a quadrant made by Ram/den, which was very good, and 
very well divided. 
The fame quadrant was ufed in obferving the tranfits of. the 
horns, and. of the limbs of the fun and of the moon, acrofs 
the horizontal and verga ings nd tbe oppor, sich 
fitted for this purpofe. 
The obferver, who, in putting on board the Sonnet 
inftruments, had nothing in view but the regulation of marine 
watches; was not fo well provided with einge as with 
Mis To o. shes ag zinn 
half nee Tu oe. 
he lue he ps anfwer Hm the end of the eclipfe, within 
< four or five feconds nearly. sheds inftant of. the beginni 
"upon the in before it was Poenis, To determine, at leaft, 
. roughly, the true inftant of the beginning of the eclipfe, an efti- 
mation was made, as near as might be, of the diftance of the 
horns, at the moment when it was perceived that an im refís 
