ME. C. V. WALKEE ON MAGNETIC CALMS AND EAETH-CUEEENTS. 
209 
Table XV. — Analysis of Observations of Earth-Currents collected 1861, 
October and November. 
CoL 1. 
Col. 2. 
Col. 3. 
October. 
November. 
0 
0 
0 
3 
2 
5 
u 
d 
u 
78 
37 
115 
d 
u 
d 
83 
27 
110 
Normal 
164 
66 
230 
u 
u 
u 
1 
10 
11 
d 
d 
d 
25 
6 
31 
Abnormal 
26 
16 
42 
u 
d 
d 
1 
1 
d 
u 
u 
1 
1 
d 
d 
u 
1 
1 
u 
u 
d 
1 
1 
Exceptional 
3 
] 
4 
276 
In October there are three cases (000), and in November two, in which no deflection 
of the needle occurred in either of the three observations ; and many individual cases are 
recorded. No particular stress is laid on these cases of no action. They merely indi- 
cate that the current, if any, was too small to afiect the particular instrument used ; a 
more delicate instrument might doubtless have given signs. 
Of the 276 complete observations, 230, or five-sixths, are in accordance with the con- 
clusions already arrived at — that the general direction of the drift of earth-currents is 
approximately N.E. or S.W. And the numbers of each kind come out nearly the same : 
115 N.E. w, d, u ; — and 110 S.W. d, u, d. The conditions of this group of results, which 
for convenience may be called normal, given graphically in Plate III. fig. 5, may be 
gathered in detail more readily from figs. 10 and 11. 
N is the magnetic north ; Jj — D, London-Dover ; L — T, London-Tonbridge ; T — D, 
Tonbridge-Dover. The respective lines of direction are further shown by the arrow- 
MDCCCLXII. 2 E 
