( 924 ) 
nh 4 yale Ae jn 
rhe terms with — .— .. ete. also contribute to each of the 
7 r? . 
coefficients of (13). 
These expansions have been executed for all the mentioned terms 
49 At 
of (3) except for the terms with — and —, 
= a 
be incomplete, these two powers of reappearing in two of the 
x 
which after all would 
succeeding terms. 
After insertion of all these terms and after some simple transforma- 
tions, equation (138) can be brought in the following form: 
) 
Li, = > nt mta? {CC [¢,(c) — 0.8488] + C, [p‚(e) + 0.0848] 0 + 
o 
+ C,[y, (w) + 0.11] 0? se le Ws, he ee 
wherein « == outer radius of coil, insulation included 
: t a 
Cys 0 BOT 9° re ges i r= Wal? 
a lj 
C,=10-159+ 69° 
C, = lo—24u + 109° n= number of windings per em. 
m == number of layers 
[== length of coil 
in ee 15 | 
En le RTE 
l Slee 
plv) = — 5 we + a 3 
Bm 
PlL) = — — —d 
Pal) 30 40 
The constants appearing in formula (14) have the following 
meaning : 
S486 —— le =a): 
1 
jk 
0.0848 = — (1 — S,) 
J 
OUI TI En S, 
15 
Wherein 5, S,, and JS, represent the sums of the above mentioned 
series. The first of these constants, which has the greatest influence 
on the accuracy of the computed values, is accurate within a few 
units of the fifth decimal place. 
