for determining the difference of meridians , &c. 
99 
July 18th. The first, seventh, ninth, and tenth rockets 
could not be observed ; one or two exploded without ascend- 
ing ; the remainder did not explode at all. 
Rockets. 
App' Time I. 
II. 
- III. 
Mean. 
1 
— 
— 
— 
2 
9 h 42 m 29.1 s 
- - 29.0 s 
- - 29.1 s 
29.07 8 
3 
- S 2 3 2 -t 
- - 32.3 
- - 32.2 
32.20 
4 
10 2 33.3 
- - 33-° 
- - 33- 2 
33* 1 7 
5 
- 12 31. 1 
- - 31.0 
- - 31.6 
3i- 2 3 
6 
- 22 29.8 
- - 29.6 
- - 29.7 
29.70 
7 
8 
- 42 29.9 
- - 3°-° 
- - 29.9 
29-93 
9 
10 
— 
— 
— 
Comparison of Chronometer and Clock. 
Chronometer. 
Before 9 U 37” 
After 11 11 
Clock. 
3-55 s 
18 56 18 95 
lj h 22 
Mean Error and Rate of Sidereal Clock. 
Mean of 6 * 8 
Mean error. 
47- 3° 8 
Mean rate. 
— 0.26* 
Comparison from the 17th to 18th — 0.93. 
Chronometer fast 1” 18.07 8 . 
