TRANSACTIONS OF SECTION 4A. 739 
coil, c* the time-average of the square of the total current per unit breadth, and a 
the thickness of the layer, 
2 ec? 
q- we ’ 
A 
where 
26 : = 910 r) c = 6 
&€  4+2sin26-¢ estas &°—2'sin 6—€ 
O= — ae Ah (esi) SS 
20 _20 @ a6: 
€ —2cos2ZA+é —E +2cos6+€& 
and 
ga274 
x 
8. The numerical results shown in the table have been calculated, and the 
ree graphic representation (Fig. 2) drawn for me by Mr. Magnus 
aclean, 
Hreteg! 
Table of Values of ®. 
ao 8 ey (25 i483 er 
vie 
1 5113 5-118 5-127 5141 
2 2-553 9-592 2-669 2-786 
4 1:316 1634 2270 3-224 
6 ‘9854 1:997 4-019 7-053 
8 ‘9173 2-993 7-143 13:37 
10 9459 4-062 10:30 19°65 
12 9822 4-899 12°73 24-48 
14 1-000 5-276 13°83 26°66 
16 1-002 5362 14-08 27-16 
i“ 5-000 3-00 25-00 
