4 1 6 Capt. Kater’s experiments for determining the variation 
the deal ends, and found them to contain 3,956 cubic inches. 
The weight of the knife edges was 370 grains, and their 
specific gravity 7,84. 
With these data, and taking the specific gravity of deal at 
0,49; the specific gravity of the whole pendulum will be 
found to vary from the more accurate determination above 
given, a quantity which would have occasioned a difference in 
the length of the seconds pendulum of only a - of an inch. 
Place of observa- 
tion. 
Latitude, 
Vibrations in a mean 
solar day. 
Length of the Pendulum 
vibrating seconds in 
parts of Sir George 
Shuckburgh’s scale. 
Unst - 
Of // 
60.45.28,01 
86096,90 
Inches. 
39,17146 
Portsoy - - 
57.40,58,65 
86086,05 
39,16159 
Leith Fort - 
55.58.40,80 
86079,40 
39**5554 
Clifton - 
53.27.43,12 
86068,90 
39,14600 
Arbury Hill 
52.12.55,32 
86065,05 
39,1425° 
London - 
0 
''f- 
00 
rn 
ti-S 
86061,52 
39 > l 39 2 9 
Shanklin Farm 
50.37.23,94 
86058,07 
39**3 6i 4 
