200 
Mr. Henderson on the difference of meridians 
2. Fairlight Chronometer. 
From July 17 to July 18. 
17 th 
h. 
m. 
s. 
h. 
ro. 
9 . 
>7 
12 
38-06 
9 
3 * 
36-15 
22 
39*55 
9 4 * 
35*90 
*7 
32 
42*39 
9 
5 * 
37-10 
17 42 
44 * 3 * 
10 
I 
37*50 
*7 52 43 98 
10 
11 
35*65 
18 
2 
49-09 
10 
21 
00 
00 
18 
12 
52-67 
10 
3 * 
40-85 
18 
22 
54*52 
10 
4 * 
40-95 
18 
42 
55*39 
11 
I 
38*55 
17th 
18th 
Mean 
G = 17 53 53*33 
G'= 17 53 32-40 
Mean 
F == 10 12 44’6 i 
F'= 10 8 28-13 
G' —0 = 23 59 39-07 F'-F= 23 55 43-52 
(G'-G) - (F'—F) =3” 553-55 
24 “X 3” 55°*55 = r* - 2 ” c6'-2C. 
43^52 
23** 55 ^ 
From July 18 to July 19. 
19th 
18th 
h. in. s. 
G' = 18 12 20-31 
G = 17 53 32*40 
h, m. s. 
F'= 10 23 17-57 
F =2 10 8 28-13 
G'— G = 24 18 47-91 F'-F= 24 14 49-44 
(G'— G) — (F'— F) = 3-" 58*-47 
24** X 3” 
24** 14“ 
=r' = f' 56>-o4. 
49 44 
h. m. s. 
20th 18 4 55-93 
18 15 4-26 
Mean. 
20th G' 22 18 10 0-10 
19th G 22 18 12 20-31 
G' — G 22 : 2 t 1:7 1Q-7Q 
24''X 3" 
=r' = 3 
21st 
20th 
23'' 53 ” 43'*58 
h. m. s. 
G' 2= 17 38 57-12 
G 22 18 10 0-10 
24** X 3 " 
5 o '*52 
23'* 25” 
6‘‘-50 
22d 
21st 
h. ra. s. 
G' = 17 47 55*64 
G 22 17 38 57-12 
20. 
h. 
m. 
s. 
10 
11 
57*85 
10 
22 
4*45 
Mean. 
: 10 
*7 
I-I5 
: 10 
23 
17-57 
= 23 
53 
43*58 
r 56 
8-21 
r 57*25- 
21. 
h. 
m. 
fl. 
: 9 
42 
7-65 
: 10 
*7 
1-15 
: 23 
25 
6-50 
50' 
'*52 
” 56' 
’*25 
22. 
h. 
m. 
S. 
= 9 
47 
8*59 
= 9 
42 
7-65 
G'— G 22 24 8 58-52 F'-F =24 5 0-94 
(G' —G) —(P—F) =3“ 57“-58 
24’'X 3 ” 57*58 
o “*94 
24” 5 " 
22 r' 22 3"' 56’-76. 
Collecting together the rates of the chronometers, we have 
Lignieres Chronometer. 
From July i8th to July 19th - - 
19th - 20th - - 
20th - 21st - - 
21st —— 22d - - 
4“ 28-38 
4 0-36 
3 57*70 
3 57*56^ 
Fairlight Chronometer. 
From July 17th to July 18th - - 
18th •—- 19th - - 
19th - 20th - - 
20th - 21st - - 
2 ISt - 22 d - - 
r 
56^-25 
56- 04 
57- 25 
56 -25 
56-76 
