IN CYLINDRICAL CONDUCTORS, ETC. 
65 
while the actual values are 
V'i = 0-345 0-360 0-292 0-242 
= 0-156 0-287 0-339 0-334 
so that if 2 is greater than 3 the values given by (21c) are fair approximations to 
the true values. The values of \js x and \Js 2 from z = 0 to 2 = 5 are plotted in fig. 1. 
(5) Eddy-Current Losses at Low Frequencies .—The argument 2 is related to the 
radius and conductance of the cylinder and the frequency of alternation of the field 
by the formula 
2 2 = Airkiaa 2 . 
If R 0 is the electrical resistance per unit length of the cylinder, the formula may be 
written 
s 2 = 4«/R..(22) 
The frequency w/2tt will be defined to be low when 2 is less than unity, so that the 
VOL. CCXXII.—A. 
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