ME. C. V. WALKEE ON MAGNETIC CALMS AND EAETH-CIJEEENTS. 
217 
Table XVIII. — Observations showing, by detaching one end of the Telegraph wire 
from the earth, that currents collected at Tonbridge, 1861, October, November, and 
December, from the London-Dover and Tonhridge-Dover lines, were true and proper 
Earth-currents. 
Date. 
Time. 
Column 1. 
Column 2. 
Column 3. 
Date. 
Time. 
Column 1. 
Column 2. 
Column 3. 
Dover-London «. 
London-Dover d. 
Dover-Tonbridge tc. 
Tonbridge-Dover d. 
Columns 1 and 2 with 
wire off earth at Ashford. 
Dover-London u. 
London-Dover d. 
Dover-Tonbridge u. 
Tonbridge-Dover d. 
Columns 1 and 2 with 
wire off earth at Ashford. 
1861. 
h m 
1861. 
h m 
Oct. 18. 
11.37 a.m. 
24 u 
34 m 
0 
Nov. 27. 
11.47 A.m. 
10c? 
15 d 
0 
1.36 p.M. 
20 u 
40 u 
0 
2.18 p.M. 
17 d 
28 c? 
0 
2.44 P.M. 
22 u 
34 m 
0 
2.38 p.M. 
18c? 
26 d 
0 
3.39 P-M- 
15 u 
16 M 
0 
Nov. 28. 
6.15 A.M. 
0 
0 
0 
Oct. 21. 
10.10 A.M. 
28 c? 
32 c? 
0 
Nov. 29. 
6.20 A.M. 
0 
5 c? 
0 
Oct. 24. 
11.47 a.m. 
13c? 
38 d 
0 
Nov. 30. 
6.21 a.m. 
5 d 
10 d 
0 
2.44 p.M. 
55 u 
50 M 
0 
Dec. 2. 
11.49 A.M. 
23 u 
34 M 
0 
4.23 P.M. 
7u 
0 
0 
2.24 p.M. 
15m 
22 M 
0 
Oct. 28. 
11.18 A.M. 
l6 c? 
12c? 
0 
Dec. 3. 
6.24 A.M. 
15c? 
18 c? 
0 
10.30 p.M. 
5 c? 
5 d 
0 
Dec. 4. 
6.15 A.M. 
5 d 
0 
0 
ll.O p.M. 
20 d 
20 d 
0 
1 2,9 P.M. 
20 M 
13m 
0 
1 1 .30 p.M. 
5 u 
5 M 
0 
1.24 p.M. 
34 m 
40 M 
0 
1 2.0 p.M. 
18c? 
20 c? 
0 
2.40 p.M. 
20 M 
16 M 
0 
Oct. 29. 
0.30 A.M. 
18c? 
20 d 
0 
Dec. 5. 
6.20 A.M. 
0 
0 
0 
1.0 A.M. 
10 d 
\2d 
0 
12.34 p.M. 
17m 
40 M 
0 
1.30 A.M. 
18c? 
20 d 
0 
Dec. 6. 
6.20 A.M. 
0 
0 
0 
2.0 A.M. 
18c? 
13 c? 
0 
Dec. 7. 
6.20 A.M. 
16 u 
25 M 
0 
2.30 A.M. 
18c? 
20 d 
0 
Dec. 9. 
7.12 A.M. 
15m 
20 M 
0 
3.0 A.M. 
15 c? 
15 d 
0 
Dec. 13. 
6.40 A.M. 
10 m 
10 M 
0 
3.30 A.M. 
15c? 
20 c? 
0 
Dec. 14. 
6.30 A.M. 
5 d 
15 d 
0 
4.0 A.M. 
12c? 
19c? 
0 
Dec. 17. 
6.17 A.M. 
10c? 
10 c? 
0 
4.30 A.M. 
9c? 
11 d 
0 
Dec. 18. 
6.18 A.M. 
15c? 
10 c? 
0 
5.0 A.M. 
8 d 
14c? 
0 
Dec. 19. 
6.20 A.M. 
0 
0 
0 
5.30 A.M. 
0 
0 
0 
Dec. 20. 
6.20 A.M. 
0 
5 M 
0 
6.0 A.M. 
0 
0 
0 
Dec. 21. 
6.18 A.M. 
0 
10 m 
0 
6.30 A.M. 
0 
0 
0 
Dec. 26. 
6.25 A.M. 
20 M 
25 M 
0 
Nov. 21. 
11.46 A.M. 
10c? 
20 c? 
0 
Dec. 27. 
6.30 A.M. 
10m 
15m 
0 
Nov. 25. 
1.31 P.M. 
0 
0 
0 
Dec. 28. 
6.17 A.M. 
0 
0 
0 
3.23 p.Nr. 
16 M 
14m 
0 
Dec. 31. 
6.19 a.m. 
25 c? 
30 c? 
0 
Nov. 26. 
3.24 P.M. 
5 u 
10 m 
0 
It will be seen that in no single instance was any deflection of the needle obtained 
when the wire was off at Ashford ; so that we are right in regarding all the currents 
with which we have been dealing, as far as atmospheric electricity is concerned, as true 
and proper earth-currents. 
Columns 1 and 2 are the deflections obtained on the London-Dover and Tonbridge- 
Dover lines in the usual way. Column 3 are the 0° resulting from repeating each of 
the two previous observations with the Ashford wire detached. 
I have also made repeated observations on the effect of polarizing the earth-plates by 
MDCCCLXII. 2 F 
