160 
MR. A. W. RUCKER AND DR. T. E. THORPE ON A MAGNETIC 
Inclination. 
Needle. 
G.M.T. 
0. 
00 - 
1 
2 
h. m. 
10 56 
11 12 
6°8 7-7 
68 6-3 
O < 
68 10-7 
Horizontal Force. 
G.M.T. 
H. 
Ho. 
V 
h. m. 
10 0 
1-7707 
1-7656 
99. Kew. Lat. 51° 28' 6"; Long. 0° 18' 45". In the Magnetic House at the 
Observatory. 
Declination. 
Date. 
Observer. 
Instrument. 
G.M.T. 
h. 
^0- 
h. m. 
18 23-7 
1°8 15-8 
July 17, 1884 .... 
T. 
60 
16 9 
,, 18, ,, .... 
R. 
60 
11 59 
18 21-9 
18 14-0 
April 2, 1886 .... 
T. 
61 
17 14 
18 11-0 
18 12-5 
September 30, 1887 . 
R. 
60 
12 33 
18 3-4 
18 14-0 
15 38 
18 5-1 
18 15-7 
October 11, 1887 . 
T. 
61 
12 11 
18 3-9 
18 13-8 
15 .33 
18 4-0 
18 13-9 
„ 12, „ . . . 
R. 
60 
12 14 
18 4-8 
18 14-7 
14 21 
18 4-3 
18 14-2 
„ 13, „ . . . 
T. 
61 
10 33 
18 5-3 
18 15-2 
15 30 
18 4-6 
18 14-5 
„ 18, „ . . . 
T. 
61 
10 47 
18 4-1 
18 14-0 
14 56 
18 2-6 
18 12-5 
„ 19, „ . . . 
R. 
60 
11 9 
18 4-8 
18 14-7 
16 1 
18 6-7 
18 16-6 
Mean 
18 14-4 
It will be observed that the differences between these results are not exactly in 
accord with those which would be deduced from the table on p. 58. 
This is due to the fact that in the above table the observations have been treated 
as though Kew were an ordinary station, whereas, on p. 58, the corrections have been 
applied in the most accurate way. 
In the first place, no attempt is made on p. 58 to reduce the observations to epoch, 
