THE ELECTRICAL ENGINEER INSTITUTE, 
K. W. = Capacity of dynamo in kilowatts. 
k = Percentage of power loss in armature. 
L, = Length of armature core. 
eS = cn ‘* active armature conductor. 
qs = Total length of armature conductor. 
Tg = Length of magnet core. 
Ae — ibe +9 $ wire 
- Iu AEN ‘* magnetic circuit. 
l, eee ies ‘* mean turn of wire on magnets. 
x = Factor of magnetic leakage. 
M = Mass of iron in armature core. 
m = Ratio of length to diameter of armature core. 
m' =  ‘* ** yadial thickness to diameter of armature core. 
N = Number of inductors on armature. : 
n ES Gian ‘* revolutions per second. 
n = es #3 - ‘* minute. 
1 
Np = = ‘* pairs of magnet poles. 
Ny = 2 «< « —« parallel armature circuits. 
Riz 
Pa = Total resistance of armature wire. 
r,, = Resistance of armature winding, cold. 
r.' ae 6“ ‘ce 6c 6c warm 
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p = Specific resistance of wire (ohms per foot). 
S. = Cooling surface of armature. 
Sn = Cross-section of magnet frame. : 
Sw = Total area of winding space on armature. 
Sw = Available area of winding space on armature. 
Ss = Specific cooling surface of armature. 
Vv = Peripheral velocity of armature. 
W = Capacity of dynamo, in watts. 
Ws, = Watts.consumed in armature winding. 
We etd zt by eddy currents. 
Wy = * a “* hysteresis. 
wt = Weight, in pounds. 
