for determining the difference of meridians , &e. 93 
M. Largeteau’s observations at Fairlight continued. 
22 Juillet. 
No. 
b. m. 
s. 
Remarques. 
L’ Canche 
9 26 
35’3 
Wrotham 
9 32 
8-9 
La Canche 
9 3 6 
39 'S 
Wrotham 
9 4 2 
6-9 
La Canch? 
9 4 6 
42-4 
3 
Wrotham 
9 S 2 
8-3 
La Canche 
4 
Wrotham 
10 2 
97 
La Canche 
10 6 
577 
5 
Wrotham 
10 1 2 
07 
Douteuse 
La Canche 
10 16 
377 
6 
I 
' i-8 
i ere Explosion I 
W rotham 
10 22 I 
8-o 
2 e >Obs. incertaine. 
La Canche 
l 
10 26 
47 9 
3 e J 
7 
Wrotham 
:o 32 
27 
I" Ex P losion 1 obs. incertaine. 
9-1 
2 e \ 
Q 
La Canche 
10 36 
59 '° 
Douteuse. 
Wrotham 
La Canche 
10 46 
37'4 
9 
Wrotham 
La Canche 
10 56 
37-8 
Tres douteuse. 
xo 
Wrotham 
1 1 2 
27 
VI. Observations made at the top of the Royal Observatory, Greenwich, on the 
rockets at Wrotham. 
July II, 1825. The blue light and all the rockets were this evening distinctly seen 
by the naked eye. The observations were made with telescopes, by three observers, 
with the same chronometer. The chronometer was compared with the transit clock 
both before and after observation. The blue light appeared about 9 h 21 m 25 s . 
Rockets. 
App* * ** Time I. 
- - - II. 
- - - III. 
Mean * 1 
1 
9 h 3 im 54 - 4 8 
- - 54 - 3 s 
- - 54.2* 
54 - 3 ° s 
2 
9 4 1 49 i2 5 
- - 49-4 
- - 49.2 
49.28 
3 
9 5 1 4575 
- - 46.2 
- “ 45-8 
45.92 
4 
10 1 47-5 
- “ 47-8 
- “ 47-4 
47.56 
5 
- - 45.8 
- - 45.4 
45.60 
6 
10 21 46.75 
- - 47 -i 
Absent. 
46.92 
7 
10 31 46.8 
- - 47-2 
- “ 47-3 
47.10 
8 
- - 49 0 
- - 48.4 
48.70 
9 
10 51 45.8 
- - 4 6 -3 
- - 46.2 
46 10 
10 
1 1 1 50.4 
- - 50.5 
- - 50.6 
50.50 
Comparison before 
after 
Chronometer 
8 h 55 m 
11 14 
Clock. 
i6 h 1 2 m 22 s . 06 
18 31 44.67 
** Mean Error and Rate of Sidereal Clock. 
Mean of transits of 5 * 6 I Corresponding mean error. 
i6 h 24m I 48.36 s 
Chronometer fast i m 17.97 s . 
Rate. 
— 0.02 
The loss of the fifth observation in column 1. was occasioned by some accidental derangement of the 
telescope. The loss of the eighth was occasioned by the rocket passing through the field of view before 
explosion. Observations 9 and 10, in column 1, were made with the naked eye. 
* In taking the mean of the three observations, those marked (: : ) doubtful, are not considered. 
** The transit observations employed throughout are reduced by the same system of corrections, 
and mean right ascensions, as those used at the observatory of Paris for that purpose ; so that no error 
in the results, from a difference of catalogues or corrections, is introduced. 
