408 
BAUER. 
the number in the first column. The probable error of these 
adopted results may be roughly given as ± 0°.5.* 
| Whiston's number, j 
Stations. 
Inclination. 
Horizontal 
vibration for 
1720. 
Relative horizontal 
force for 1720. 
London - 1. 
Name. 
Lati¬ 
tude. 
Longi¬ 
tude. 
12-inch 
needle, 
1719. 
P 
‘ ® 1 
Adopt¬ 
ed for 
1720. 
T 
120°. 
o 
o 
o 
o 
/ 
o 
Sec. 
Sec. 
24 
Kew. 
51.47 
0.31 W. 
75 
09i 
74.6 
25 
Greenwich. 
51.48 
0.00 
75 
14A 
74.5 
22 
Windsor. 
51.48 
0.59 W. 
75 
05 
74 3 
23 
London. 
51.52 
0.12 W. 
73% 
75 
12 
74 5 
60% 
42.6 
1.000 
26 
Wanstead. 
51.58 
0.04 E. 
75 
19 
74.7 
21 
Dunstable. 
51.88 
0.50 W. 
75 
24 
74.7 
"59% 
’”' 42.2 
1.018 
20 
Ainhol. 
52.00 
1.27 W. 
74 
75 
25 
74.7 
59% 
41.9 
1.033 
19 
Banburv. 
52.06 
1.33 W 
75 
25 
74.7 
60 
42.4 
1.009 
18 
Maidford...... 
52.20 
1.22 W 
74% 
75 
37 
74.9 
59% 
42.2 
1.018 
17 
Lich borough. 
52.22 
1.19 W. 
75 
37 
74.8 
60 
42.4 
1.009 
16 
Northampton. 
52.25 
0.91 W. 
75 
44 
75.0 
60 
42.4 
1.009 
15 
Harrington. 
52.40 
0.89 W. 
75 
56 
75.2 
59 
41.7 
1.044 
8 
Leicester. 
52.63 
1.15 W. 
76 
06 
75.3 
62 
43.8 
0.946 
10 
Tamworth. 
52.63 
1.64 W. 
75 
49 
75.1 
61% 
43.6 
0.954 
9 
Bosworth. 
52.64 
1.36 W. 
76 
00 
75.2 
59% 
42.1 
1.024 
7 
London *. 
52.66 
0.73 W. 
74% 
76 
14 
75.4 
63 
44.5 
0.916 
11 
Rugely ... 
52.77 
1.93 W. 
75 
52 
75.1 
62 
43.8 
0.946 
5 
Barkston. 
52.93 
0.62 W. 
74% 
76 
32 
75.6 
64 
45.2 
0.8S7 
6 
Belton. 
52.94 
0.65 W. 
76 
40 
75.8 
63% 
45.0 
0.896 
12 
Oure. 
53 00 
2.53 W. 
76 
05 
75.3 
60 
42.4 
1.009 
13 
Chester. 
53.19 
2.89 W. 
76 
22 
75.4 
59% 
41.9 
1.033 
4 
Lincoln.. 
53.1 
0.45 W. 
64 
45.2 
0.887 
3 
Wragby. 
53 3 
0.15 W. 
64% 
45.4 
0.880 
2 
Louth. 
53.35 
0.10 W. 
66 
46.7 
0.831 
14 
Liverpool, 8 miles 
west of. 
53.41 
3.12 W. 
76 
34 
75.8 
1 
Saltfleet. 
53.42 
0.19 E. 
77 
15 
76.4 
66 
46.7 
0.831 
* Whiston gives the magnetic declination at London as 17° 15' W. for 1720. Whether 
this is an observed quantity cannot be ascertained. 
The eighth column gives the observed horizontal vibra¬ 
tions 120° from the magnetic meridian with a 4-foot needle, 
as given by Whiston on his second map. The next column 
contains the horizontal vibrations, as reduced by myself to 
the magnetic meridian. The last column represents the 
distribution of the relative horizontal force, taking the value 
at London as unity. The figures were obtained from the 
foregoing column with the aid of the rule that the force 
varies inversely as the squares of the vibration times. 
* In case these inclinations are adopted the isoclinics in the sketch on 
page 403, as drawn by Felgentraeger, would receive a constant correction 
of about — 0°.8. The relative value of the isoclinics would, of course, not 
be affected. 
