466 Prof. A. W. Riicker on the Self-Regulation 
which may be written 
Py Qi 
oie A, +2, ae By +a. 
if 
M a Tat 
Pp, 0 Re ea So 3 
ie o 4p1(Ta+ pa) + ?apat’ ie pi(tat pa) + Tapa’ ( ) 
a sell PB 16 Diy Dy ae i 
mi G(Sspi + siPa) seer eipe | 
In like manner, since c,=¢/72, 
eget { ee 
oo Lre(tat pa) tPi(Pat Pa) Haha 28a (Sar + S1Pa) 
which may be written 
P, io Q. 
Agta Bota, 
Co = 
if 
nMpa Piat Pa) + Tapa 
=——*., A= ese —CC«G 
2 o(’at Pa) ’ 2a Pat Pa ( ) 
a Sa +S a 
Ol ee B= slice eles Ly = 19 
oSa Si, 
Long-Shunt Compound Dynamo. 
A 
7> 
p; E, 
x = Y 
In this case 
Ui == (Una 2) 6 
The conductors p, and pz represent the series- and shunt-coils, 
and 7, represents the external resistance. 
Hence 
R4=pi, RB’e=rop./ (2+ 2), 
Rang, + ae te he Fhe) ale 
19 Pa Po + pe 
Slag Hg Rope gom ro( 8, +82) + Sipe , 
ToT Pe To + Pg 
