[ 305 3 
VARIATION NEEDLE. 
Month. 
7 |i - 
A.M. 
H-l 
j 
2 h. 
P.M. 
10 or 1 1 h. 
P.M. 
July 2 
O 
22 19 
0 / 
22 29 
0 / 
22 38 
0 / 
22 31 
3 
22 16 
22 13 
22 35 
22 27 
4 
22 25 
22 35 
22 21 
22 28 
5 
22 27 
22 34 
22 38 
22 25 
6 
22 iB 
22 34 
22 37 
22 54 
7 
22 25 
22 4O 
22 38 
22 17 
8 
22 15 
22 34 
22 25 
22 34 
9 
22 32 
22 39 
22 49 
22 39 
10 
22 l8 
22 28 
22 l6 
22 34 
11 
22 19 
22 3,1 
22 34 
22 32 
12 
22 22 
22 37 
22 41 
22 30 
22 21 
22 44 
22 30 
22 25 
14 
22 17 
22 34 
22 OO 
22 14 
iS 
22 24 
22 39 
22 41 
22 47 
Means 
22 21 
22 34 
22 32 
22 31 
Mean of all 22 0 29^ 
Mean, allowing for the error of the inftrument, vide 
vol. lxvi. p. 382. and vol. lxix. p. 321. = 22° 28'. 
Therefore, as the variation at the Society’s houfe 
feems to be 1 5,4 greater than it ought to be by reafon of 
the magnetifm of the building (vide fame place) the 
true variation feems to be 22 0 4.4. 
R r 
Vol. LXX . 
DIE- 
