58 
MR. A. W. RUCKER AND DR. T. E. THORPE ON A MAGNETIC 
Observations in the Kew Magnetic House. 
Declination. 
Date. 
Insti’u- 
ment. 
Observer. 
S 
(Survey 
Instrument.) 
K 
(Kew 
Instrument.) 
K - S = ^. 
K- 
i3 = K'. 
S - K'. 
1884. 
O 
/ 
O 
/ 
o 
/ 
1 
July 17. 
60 
T 
18 
26-3 
18 
28-6 
2^3 
18 
26T 
+ 02 
„ 18 . . 
60 
R 
18 
27-4 
18 
29-9 
2-5 
18 
27-4 
0-0 
1886. 
April 2 . 
61 
T 
18 
12T 
18 
14-4 
2-3 
18 
11-9 
+ 0-2 
1887. 
Sept. .30 . 
60 
R 
18 
8-8 
18 
13-1 
4-3 
18 
10-6 
- 1-8 
18 
5-5 
18 
9-4 
3-9 
18 
6-9 
- 1-4 
Oct. 11 . 
61 
T 
18 
6-0 
18 
8-7 
27 
18 
6-2 
- 0-2 
18 
6-9 
18 
10-4 
3-5 
18 
7-9 
- 1-0 
„ 12 . . 
60 
R 
18 
9-5 
18 
11-9 
2-4 
18 
9-4 
+ 0-1 
18 
111 
18 
13-4 
2-3 
18 
10-9 
+ 0-2 
„ 13 . . 
61 
T 
18 
5-8 
18 
6-7 
0-9 
18 
4-2 
+ 1-6 
18 
8-6 
18 
8-8 
0-2 
18 
6-3 
+ 2-3 
„ 18 . . 
61 
T 
18 
6-3 
18 
8-4 
2T 
18 
5-9 
+ 0-4 
18 
6-0 
18 
10-4 
4-4 
18 
7-9 
- 1-9 
„ 19 . . 
CO 
R 
18 
8T 
18 
10-3 
2-2 
18 
7-8 
+ 0-3 
18 
6-9 
18 
87 
1-8 
18 
6-2 
+ 07 
/5 = 2-5 
Mean . 
= ± 0-82 
Horizontal Force. 
Date. 
Instru¬ 
ment. 
Observer. 
S 
(Survey 
Instrument.) 
K 
(Kew 
Instrument.) 
1 
Ul 
II 
K-/l= K'. 
S-K' 
= 0-000. 
1884. 
July 17 . . 
60 
T 
1-8080 
1-8055 
- 0-0025 
1-8084 
- 4 
1886. 
April 2 . 
61 
T 
1-8091 
1-8070 
- 0-0021 
1-8099 
- 8 
60 
R 
1-8107 
1-8072 
- 0-0035 
1-8101 
+ 6 
„ 22. . 
60 
R 
1-8110 
1-8082 
- 0-0028 
1-8111 
- 1 
: 1887. 
Sept. .30 . 
60 
R 
1-8117 
1-8087 
- 0-0030 
1-8116 
+ 1 
i Oct. 11 . 
61 
T 
1-8114 
1-8084 
- 0-0030 
1-8113 
+ 1 
„ 12 . . 
60 
R 
1-8096 
1-8070 
— 0-0026 
1-8099 
O 
— O 
., 13 . . 
61 
T 
1-8092 
1-8062 
- 0-0030 
1-8091 
+ 1 
„ 18 . . 
61 
T 
1-8114 
1-8088 
- 0-0026 
1-8117 
- 3 
„ 19 . . 
60 
R 
1-8117 
1-8113 
1-8088 
1-8074 
- 0-0029 
- 0-0039 
1-8117 
1-8103 
0 
+ 10 
1 
ji- — 0-0029 
Dlean . 
+ 3-5 : 
