for determining the difference of meridians , &c. 
95 
July 13th. All the signals were visible to the naked eye. 
Rockets. 
App' Time I. 
II. 
- III. 
Mean. 
1 
9 h 3 i m 55 - 8 s 
9 h 3i ra 55.6 s 
55.6* 
55.67 s 
2 
— 
3 
9 5 i 55-75 
51 56.0 
: : - 55.2 
55-87 
4 
10 1 55.0 
10 1 55.2 
- - 54-8 
55.0 
S 
11 57.4 
11 57-3 
- - 57.6 
57-43 
6 
21 57.2 
21 57.0 
- ~ 57 -o 
57-©7 
7 
31 56.6 
31 56.6 
- “ 5 6 - 5 
5 6 -57 
8 
41 56.0 
41 56.0 
- - 55-8 
55-93 
9 
00 
5 i 55 - 6 
- - 55-3 
55-57 
10 
“ 
11 1 56.2 
- - 56.2 
56.2 
Chronometer. 
Comparison. Before - g h i 6 m [ i6 h 41"* 16.63 s 
After - - 11 13 | 18 38 35.75 
Mean Error and Rate of Sidereal Clock. 
Mean of 6 * s 
1 6 h 4o m 
Mean error corresponding. 
48-39 s 
Mean rate. 
+ o-H 
Comparison 12th to ditto 13th. Chronometer, + 0.87. 
Chronometer fast i m 19.86 s . 
The 2d rocket was lost by all the observers : it did not appear till some seconds 
after the time specified ; and when it did appear it exploded immediately. It 
exploded about 9 h 42” 22’. 
The 10th rocket in column I. was lost by a derangement of the telescope. 
The third observation, column III. is doubtful to half a second. 
