192L] Caldwell and Marsden.—Inductive Interference 
291 
On the whole, these experiments amply verify Parry’s methods of 
calculation, and his formulae may therefore be used to calculate the 
effects to be expected in any particular case. Thus for a long telegraph- 
wire of No. 11 S.W.G., 18 ft. above ground, and isolated at 1 chain 
from a 66,000-volt transmission-line, the induced voltage will be as 
tabulated. For other voltages the values will be roughly proportional, 
depending upon the height and spacing and diameter of the transmission¬ 
line conductors. 
Transmi ssion-line. 
Voltage. 
Induced Voltage (R.M.S.) at 
1 Chain. 
2 Chains. 
3 Chains. 
100,000 
200 
52 
21 
66,000 
131 
34 
14 
11,000 
22 
6 
| 
2 
Sndvced £ / ec/~ros/~a/~/o Vo/f a ges u//fh one 7~ransrr>/ss/or?„ L/ne A//re 
Fig. 4. 
Fig. 5. 
