t 365 3 
3 1 ^ 3 1", whence the value of the fcale of the micro- 
meter was determined for the prefect purpofe. Hence 
the eclipfed parts of the Sun were 16' ib" or 
6 dlg . 1 1^62 on the northern part of his difc. 
Mr. Hitchins obferved the beginning of the eclipfe 
with a 34. feet achromatic telefcope magnifying 1 50 
times (the fame with which Mr. Doilond obferved 
the contacts of Venus), at i8 h 38' 59", and the end 
of the eclipfe with the 6 feet refledtor with the mag- 
nifying power 90, at 2o h 23' 35' apparent time. 
And Mr. Samuel Dunn obferved the beginning of 
the eclipfe at i8 h 39' 9", and the end at 2o h 23' 33" 
with the other 34-feet achromatic telefcope, magni- 
fying 140 times, the fame with which he obferved 
the contacts of Venus. Several inequalities in the 
Moon’s circumference, feen upon the Sun’s difc 
during the eclipfe, were diflindtly difcerned by all of 
us, the air being very clear, and the objedts heady. 
The whole ferie9 of meafures of the lucid parts, which I 
took with the achromatic objedt glafs micrometer applied to the 
2 feet telefcope, was as follows ; 
Apparent 
time. 
Lucid parts. 
h ' 
// 
/ 
tt 
IQ 22 
13 ~ 
T 5 
40,5 
24 
21 - 
- - »5 
26,5 
26 
9 “ 
- - 15 
20,9 
28 
26 - 
05,6 
3 ° 
14 - 
Hv 5 
31 
44 “ 
- - 15 
16.4 
32 
30 - 
- - 15 
16,4 
33 
19 - 
- - H 
19,8 
34 
28 - 
- ~ H 
2 5’4 
3 5 
19 - 
35,9 
37 
5 6 - 
J 5 
49 - 1 
A N 
