PRODUCED BY ALTERNATING ELECTRIC CURRENTS. 
303 
M t = 
Ni = 
Qi = 
Ri = 
m 3 = 
No = 
Q 2 — 
K 2 = 
Mg = 
Ng = 
Q 3 = 
R.3 = 
m 4 = 
n 4 = 
Q 4 = 
K-4 = 
27rape 
^T 
2'irapc. 
2\ab ax>J_ 
+ ^ 1 
Di 
47T 2 «. 2 p 2 
6 3 + c 
2Iac 
+ + C 2 + ^ 1_ 
2 la& aa' 
* + # ^ 1 
i>i L v + 
47r 2 a 2 p 2 [~ , 2 lac ( aa r - D , 
+ LTUUi 
6 2 + c 2 
I>i 
47 Taper 
D 2 L(6 2 + c 2 ) ! 
'a 2 A 2 
1 + ^rQ'i 
47T 2 «y aa' A/r , 
D, <P Ml ’ 
47T 2 <x 2 p 2 aa! ,,, 
' ~dT ^ 15 
2irapcr aa' ^ T , 
‘ ~dT * M l ’ 
2irapa aa' AT , 
' 15 
47 r 2 a 2 p 2 aV , 
d 7~ lJ 
47T027CT 
47r 2 a 2 p 2 
D 3 
kn 2 a 2 p 2 
D 
2a 2 bc 
(b 2 + c 2 ) 
'a 2 .& 2 — c 2 
■2V 
_(& 2 + c 2)2 1 D " # MS 1 
2 L 
2a 2 bc 
2V 
T a " a -p/ 
9\2 1 ~ c] i ^ ] 
(& 2 + C 2 ) 
47r 2 a 2 p 2 era! 
"5T dF " 1* 
kirapcr a 2 a' 
~dF~ IF M15 
47 Taper a 2 a' AJ/ 
“ ”dT ^ 
67rapa 2a s b (3c 2 — 6 2 ) ^ 
D, 
(6 2 + e 2 ) 3 
Qirapcr 2a s c (c 2 — 3?> 2 ) ^ 
_ (6 2 + c) 3 5 
4 7 r 2 a 2 p 2 2a 3 5 (3c 2 - b 2 
D 3 ( b 2 + c ) 3 L ’ 
<kir 2 a 2 p 2 2a z c (c 2 — 36 2 ) _ 
(6 2 + c 2 ) 3 L ’ 
Snaper a i (6 4 + c 4 — 6& 2 c 2 ) 
D. 
2 ( b 2 + c 2 ) 4 
I, 
871 -aper 2a i bc (b 2 — c 2 ) 
“©I (6 2 + c 2 ) 4 ’ 
47 r 2 a 2 p 2 a 4 (J 4 + c 4 — G& 2 c 2 ) 
D, 
2 (6 2 + c 2 ) 4 
I, 
47r 2 a 2 p 2 2a 4 5c (5 2 — c 2 ) 
”1^ (JS + C 2 } 4 
I. 
The equations that hold for the a, b' shell may be obtained from the above by 
