SURVEY OF THE BRITISH ISLES FOR THE EPOCH JANUARY 1, 1891. 
25 
Comparisons at Kew of Dip Circle, No. 83, with the Kew Standard. 
Date. 
Observer. 
S 
(Survey 
Instrument). 
K 
(Kew 
Instrument). 
K-S=/3. 
II 
1 
S-Kt 
Oct. 11, 1887 . . . 
T. 
67 34-3 
6^7 35-3 
+ 1-0 
67 34-.5 
-6-2 
„ 13, „ . . . 
T. 
67 36-0 
67 36-4 
+ 0-4 
67 35-6 
+ 0-4 
,, 18, ,, , . . 
T. 
67 34-2 
67 35-2 
+ 1-0 
67 34-4 
-0-2 
/3=+0-8 
Mean 
= ± 0-3 
June 14, 1890. 
B. 
67 30-1* 
67 31-3 
+ 1-2 
67 29-7 
-1-0-4 
„ 16, „ . . . 
B. 
67 29-9 
67 31-8 
+ 1-9 
67 30-2 
-0-3 
,, 17, ,, . . . 
B. 
67 29-3 
67 31-2 
+ 1-9 
67 29-0 
-0-3 
B. 
67 30-5 
67 31-9 
+ 1-4 
67 30'3 
+ 0-2 
,, 19, ,, . . . 
B. 
67 31-8t 
67 33-2 
+ 1-4 
67 31-6 
+ 0-2 
/3=+l-6 
Mean 
= ± 0-3 
April 20, 1891 . . 
W. 
67 29-3 
67 30-5 
+ 1-2 
67 29T 
+ 0-2. 
W. 
67 29-0 
67 30-4 
+ 1-4 
67 29-0 
0-0 
„ 22, „ . . 
W. 
67 29-6 
67 31-3 
+ 1-7 
67 29-9 
-0-3 
/3= + l-4 
Mean 
= ± 0-2 
Oct. 20, 1892 . . . 
G. 
67 30-5 
67 30-5 
0-0 
67 29'8 
+ 0-7 
„ 20, „ . . . 
G. 
67 .30-0 
67 30-3 
+ 0-3 
67 29-6 
+ 0'4 
„ 21, „ . . . 
G. 
67 29-6 
67 31-2 
+ 1-6 
67 30-5 
-0-9 
,, 21, ,, . . . 
G. 
67 31-0 
67 30-8 
-0-2 
67 30-1 
+ 0-9 
,, 21, ,, . . . 
G. 
67 29-4 
67 31-2 
+ 1-8 
67 30-5 
-11 
/3= + 0-7 
Mean 
= ± 0-8 
The observations in 1891-92 were made with needles 2 and 3, see p. 7. 
* Needle 2 only. 
t Needle 1 only. 
MDCCCXCVI.—A. 
e 
