292 
Mr. Henderson on the difference of meridians 
Computation of the difference of meridians ; all the observers taken jointly. 
July i8. 
p 
L 
L' 
F 
F 
G. 
h. m. s, 
18 15 40-37 
18 35 41-13 
18 45 44-13 
ll. ID. 5 . 
lo 29 34-40 
lo 49 32 80 
lo 59 33-60 
h. m. s. 
9 54 52-00 
10 14 54-00 
h. ra. s. 
9 46 29-75 
10 6 31 -40 
h. ni, s. 
9 41 46-20 
9 5 » 49-60 
10 I 50-30 
10 II 48-60 
10 21 46-90 
10 41 47-20 
h. m . s, 
17 26 46*17 
17 36 50-97 
17 46 53-59 
17 56 5329 
18 6 53-41 
18 26 56-95 
Mean 
+ 18 32 21-88 
+ 59-53 
Mean 
ro 46 13-60 
= /'-/ 
T ' T — 
Mean 
10 4 53-00 
— 41 20-60 
— 6-97 
Mean 
9 56 30-57 
Mean 
10 8 28-13 
V^l = 
Mean 
- >7 53 32-40 
41 27*57 
+ 18 44 21-41 
—18 34 59-97 
Reduction = 
F'—F = 
Reduction 
+ II 57-56 
+ >-97 
- >8 34 59-97 
1 ' —1 = 
= DifF. Merid“ 
— 41 27-57 
9 21-44 
/'“/ = 
+ II 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 
b. m.^ s. 
9 39 30-40 
10 49 4110 
10 59 30-40 
h'. m. s. 
9 44 49-40 
9 54 49-90 
10 34 49-70 
10 54 53-40 
b. m. s. 
9 36 33-10 
9 46 33-65 
10 26 33-70 
10 46 37-55 
b. m. s. 
9 42 0-45 
9 5 > 53 65 
10 I 56-50 
10 22 2-45 
10 32 24-75 
io 41 59-80 
10 51 59-60 
11 2 3-40 
h. in. s. 
17 30 56-55 
17 40 51-34 
17 50 55-76 
18 II 5-07 
18 21 28-63 
18 31 5-57 
18 41 7-08 
18 51 12-47 
Mean 
+ i8 19 41-83 
+ 14 >5-4* 
Mean 
10 29 33-97 
= /'-/ 
r.' T — 
Mean 
10 17 20-60 
— 12 13-37 
— 2-05 
Mean 
10 9 4-50 
F' — F — 
Mean 
IO 23 17-57 
l ' — l = 
+ 14 13-07 
+ 2-34 
Mean 
—18 12 20-31 
— 12 15-42 
+ 18 33 57-24 
—18 24 35-73 
Reductions: 
Reduction = 
—18 24 35-73 
l'—l = 
= Diff. Mer' 
/'“/ = 
+ 14 >5-41 
9 21-51 
\ 2 I ^ 4 ^ 
