292 
Mr. Henderson on the difference of meridians 
Computation of the difference of meridians ; all the observers taken jointly. 
July 18. 
p 
L 
L' 
F 
F' 
G. 
h. m. s. 
18 15 40-37 
18 35 41-13 
18 4s 44-13 
li. m, s. 
lo 29 34-40 
io 49 32 80 
no 59 33-60 
h. m. $. 
9 54 5 2 ’ 00 
io 14 54-00 
li. m. s. 
9 46 29-75 
10 6 3 1 -40 
h. m. s. 
9 41 46-20 
9 5 1 49 ‘ 6 ° 
10 1 50-30 
10 11 48-60 
IO 21 46-90 
10 41 47-20 
h. m. s. 
17 26 46*17 
17 36 50-97 
*7 46 53-59 
17 56 53 29 
18 6 53-41 
18 26 56-95 
Mean 
+ 18 32 21-88 
+ u S 9’53 
Mean 
eo 46 13-60 
= /'-/ 
T ' T _ 
Mean 
10 4 53-00 
- — 41 20”6o 
— 6 '97 
Mean 
9 5 6 30-57 
Mean 
10 8 28-13 
l ‘ — l = 
Mean 
- 17 53 32-40 
41 27*57 
-J-i8 44 21-41 
—18 34 59 97 
Reduction = 
F'— F = 
Reduction = 
+ 11 57'56 
+ i -97 
- 18 34 59-97 
l ' — 1 = 
= Diff. Merid 8 
— 41 27-57 
9 21 '44 
/' -/ = 
+ 11 59-53 
July 19. 
P 
L 
L' 
F 
F' 
G 
h. m, s. 
17 29 29-60 
18 39 52-50 
18 49 43-40 
h. iu._ s. 
9 39 30-4° 
10 49 41-10 
10 59 30-4° 
h. m. s. 
9 44 49-40 
9 54 49 - 9 o 
10 34 49-70 
10 54 53-40 
h. m. s. 
9 36 33 '!o 
9 46 33- 6 5 
10 26 3370 
10 46 37-55 
li. m. s. 
9 4 2 o -45 
9 5 1 53'65 
10 1 56-50 
10 22 2-45 
10 32 24-75 
io 41 59-80 
10 51 59-60 
11 2 3-40 
h. m. s. 
1 7 30 56-55 
1 7 40 5**34 
17 50 55-76 
18 11 5-07 
18 21 28-63 
18 31 5-57 
18 41 7-08 
18 51 12-47 
Mean 
+ 18 19 41-83 
+ 14 I 5 ' 4 I 
Mean 
10 29 33-97 
= /' -/ 
L' — L = 
Reductions: 
Mean 
10 17 20-60 
— 12 I 3-37 
— 2-05 
Mean 
10 9 4-50 
P' _ F — 
Mean 
10 23 17-57 
l ' — l = 
+ 14 13*07 
+ 2-34 
Mean 
— 18 12 20-31 
— 12 15-42 
+ 18 33 57-24 
—18 24 3573 
Reduction = 
—18 24 3573 
r— l = 
— Diff. Mer 8 
12 15-42 
/'-/ = 
+ H * 5 * 4 * 
9 21-51 
