102 
Mr. Herschei/s account of a series of observations 
July 21 . The rockets much worse this evening than they 
were last. Only one out of the whole number mounted at 
all. All the others were seen, but nothing was sufficiently 
definite to admit of being noted. * * 
Rockets. 
App‘ Time I. 
- - - II. 
- - - III. 
Mean. 
1 
— 

— 
2 
9 h 42" 48.8 s 
- - 48.8 s 
00 
OO 
"d- 
1 
I 
48.8 s 
3 
— — 
• 
— - 
4 
— 
— 
— 
5 
— 
- - - 
— 
6 
7 
8 ^ 
9 
lO 
— 
— 
— 
— 
Comparisons of Chronometer and Clock. 
Chronometer. 
Before 9 h 13™ 
After u 10 
Clock. 
i h 9 m 50. 88 s 
19 7 993 
Mean Error and Rate of Sidereal Clock. 
i7 h z6 n 
Error. 
47-37 
Rate. 
+ 0.20 s 
Comparisons from 20 to 21, +1.02 
Chronometer fast i m 17.63* 
* It is much to be regretted that some attempt at least to note them was not 
made. Had it been done, this night’s result, which is now dependent on a single 
signal, might perhaps (as they were for the most part tolerably well observed at 
Wrotham), have been placed nearly on the same footing with the rest. H.) 
