]VIE. C. V. WALKEE ON MAGNETIC CALMS AND EAETH-CUEEENTS. 
215 
Tonbridge-London wire. The direct line between London and Hastings is 53 miles. I 
have thus an opportunity of making observations on the whole of this line, or on either 
half, the direction of all three being the same. The results of these observations are 
given in Table XVII. Column 1 contains the value of currents collected on the whole 
line of 53 miles ; column 2, those on the London half of 27 miles ; and column 3, those 
on the Hastings half of 26 miles. 
Table XVII. — Directions and Values of Earth-Currents collected at Tonbridge, 1861, 
November and December ; from the London-Hastings, London-Tonbridge, and 
Tonbridge-Hastings lines. ' 
Date. 
Time. 
Column 1. 
Col limn 2. 
Column 3. 
Date. 
Time. 
Column 1. 
Column 2. 
Column 3. 
^ 
03 m 
to ip 
q <33 
© CO 
bjQ bX) 
5 1= 
q 
re 'Ti 
23 
o 2 
CC I 
o ^ 
§ 
0 S 
H o 
01 ^ 
q 23 
3 ” 
0 C-J 
S q 
q 
0 w 
S i 
(K bp 
ClC^ 
23 .3 
■d rS 
« o 
k3 
0 0 
W&H 
1861. 
Nov. 15. 
h m 
12.34 p.M. 
8rf 
18 d 
0 
1 d 
1861. 
Nov. 29 . 
h m 
6.24 A.M. 
0 
2 M 
0 
5 M 
0 
0 
1.56 P.M. 
8rf 
24 d 
Nov. 30. 
6.17 A.M. 
5 M 
10 M 
0 
Nov. l 6 . 
10.19 a.m. 
ill 
44 M 
6 u 
Dec. 2 . 
11.48 A.M. 
0 
8 d 
0 
10.53 A.M. 
20 d 
50 d 
0 
Dec. 3. 
6.13 A.M. 
hd 
0 
5 d 
Nov. 17. 
12.35 p.M. 
5 u 
10 ti 
4 M 
Dec. 4. 
6.17 A.M. 
lOd 
15 d 
5 d 
Nov. 20 . 
7.37 A.M. 
hd 
10 d 
0 
1.29 P.M. 
0 
16 d 
1 d 
10.50 A.M. 
7 11 
8 u 
4 M 
Dec. 5. 
6-24 A.M. 
hd 
0 
5 d 
Nov. 21 . 
7.10 A.M. 
0 
5 d 
0 
Dec. 6 . 
6-37 A.M. 
0 
0 
9.35 A.M. 
12m 
18 m 
0 
Dec. 7 . 
6-22 A.M. 
0 
5 d 
0 
11.46 A.M. 
4 ic 
6 11 
3 M 
Dec. 9 . 
7 D 6 A.M. 
5 d 
0 
5 d 
12.49 P.M. 
0 
0 
5 u 
Dec. 1.3. 
6.43 A.M. 
0 
0 
0 
Nov. 23. 
6.22 A.M. 
hd 
lOd 
0 
Dec. 14. 
6.33 A.M. 
5 M 
10 m 
0 
9.1 A.M. 
0 
10 m 
0 
Dec. 17 . 
6-29 A.M, 
0 
5 d 
0 
Nov. 25. 
1.34 p.M. 
6 M 
1 2 M 
4 M 
Dec. 18. 
6.20 A.M. 
5 d 
lOd 
5 d 
2.47 p.M. 
8 M 
5 M 
9 ic 
Dec. 19- 
6.21 a.m. 
hd 
\0d 
5 d 
3.24 p.M. 
8 M 
23 m 
7u 
Dec. 20. 
6-20 A.M. 
lOd 
2hd 
5 d 
Nov. 26. 
6.34 A.M. 
0 
lOd 
0 
Dec. 21. 
6.22 a.m. 
Ih d 
28 d 
10 d 
Nov. 27. 
6,17 A.M. 
0 
0 
0 
Dec. 26 . 
6.30 A.M. 
0 
lOd 
0 
12.32 p.M. 
Id 
hd 
5 d 
Dec. 27. 
6-34 A.M. 
0 
o 
0 
2.18 p.M. 
0 
3 M 
0 
Dec. 28. 
6.21 A.M. 
0 
0 
0 
Nov. 28. 
6.17 A.M. 
0 
0 M 
2d(?) 
Dec. 31. 
6.23 A.M. 
0 
0 
0 
If the value of these derived currents depended simply on the mere distance between 
the earth-plates or observing-stations, and their bearing each on the other, it is obvious 
that the values in columns 2 and 3 would be identical, or in this case nearly so. The 
London-Tonbridge wire-length is 41 miles ; the Tonbridge-Hastings 33 ; so that the 
value on the latter length should be a little higher if anything, the resistance being less. 
But, with very rare exceptions, the Tonbridge-Hastings values are seen to be greatly 
below the Tonbridge-London. The contrast is remarkable. In some cases the differ- 
ences are very conspicuous. I have made a sufficient number of observations, extended 
