599 
o _> 
STAFF CAPTAIN F. J. EVANS ON THE 
vatories of Greenwich, Kew, and Stonyhurst College in recent years will be seen from 
the following abstract. The determinations at Greenwich have been extracted from 
communications of the Astronomer Royal, — those prior to 1858 from contributions to the 
Nautical Magazine ; subsequent to that year from the Greenwich Magnetical Observations 
and the Annual Reports made to the Board of Visitors. 
The Kew results have been obtained through the kindness of the Observatory Super- 
intendent, Samuel Jeffery, Esq. ; and those from Stonyhurst College from the Meteoro- 
logical and Magnetical Observations published annually. 
Greenwich Observatory. Lat. 51° 28' 3S" N. Long. 0 h 0 m 0 s . 
Mean Westerly Differ- Annual 
declination. ence. decrease. 
1842 
1 850 
1855 
I860 
1865 
1871 
23 
22 
21 
21 
20 
19 
14 - 5 , 
24-3 [ 
48 * 0 } 
1 4*3 f 
32 * 7 !' 
45 * 0 ' 
50-2 
36*3 
33-7 
41-6 
47-7 
6-27 
7*26 
6-74 
8-32 
7*95 
Kew Observatory. Lat. 51° 28' 6" N. Long. 0° 18' 47" W. 
1858 
1860 
1865 
1871 
21 54*1 \ }4 . 2 - ? . 10 
21 39 -<K 
20 50 - 0 > 40 ’ 9 = 8 ' 18 
20 10 - 5 } 48 ’ 5 = 8> 08 
Stonyhurst College Observatory. Lat. 53° 50' 40" N. Long. 2° 28' 8" W. 
The observations in my possession made at this Observatory do not extend further 
back than 1865 ; as the Declination is observed monthly under nearly similar conditions 
in each year, I have preferred adopting the comparative monthly results for 1865 and 
1871, to the mean annual values for those years as appended to the Observatory Reports. 
t 
Differ- 
ence. 
January < 
22 31*4 1 
21 48 - 1 / 
February < 
[22 31-2 1 
L 21 59 - 3 / 
March < 
[22 22-51 
21 38-1 J 
M ril < 
22 16-4 1 
21 35 - 6 / 
May < 
22 21 *2 1 
L 21 37 - 3 / 
1 865 
and 
1871 . 
June < 
J^y j 
22 18-7 1 
21 37 * 3 / 
22 24-1 1 
[21 23-6 J 
August • 
22 19*2 \ 
[21 37*5 J 
September 
22 30-3 1 
[21 35-7 J 
October < 
[22 23-01 
21 35-5 f 
November • 
[22 27*5 \ 
[21 32 - 5 ] 
December 
; 22 21-2 \ 
21 31-5 j 
43 - 3 
31-9 
44 - 4 
40 - 8 
43-9 
41 - 4 
60-5 
41-7 
54-6 
47-5 
55*0 
49-7 
Annual 
decrease. 
= 7 - 22 
= 5-32 
= 7-40 
= 6-80 
= 7-32 
= 6-90 
= 10-08 
Mean 
value. 
> 771 
= 6-95 
- 9-10 
= 7-92 
= 9-17 
= 8-28 
