240 
Captain Hall's details of experiments 
Extreme Stations. 
Diminution 
of Gravity 
from Pole to 
Equator. 
Ellipticity 
Length of 
Equatorial 
Pendulum. 
Unst in . 
° / // . O / 
oo 45 28 and Galapagos in 0 32 
// 
19 
,0051945 
X 
39.01715 
289,35 
Portsoy in . . 
57 40 59 
,0051833 
I 
•° 1 7 1 5 
288,41 
Leith Fort in 
55 58 41 
,0051632 
I 
.01718 
286,76 
Clifton . . . 
53 2 7 43 
,0051038 
I 
.01715 
281,93 
Arbury Hill . 
52 12 56 
,0051316 
I 
.01744 
284,18 
London . . 
51 31 9 
,0051083 
I 
.01715 
282,31 
Shanklin Farm 
50 37 24 
,0051038 
I 
•01715 
281,92 
Mean . 
,0051412 
I 
39.017196 
284,98 
