ALTERNATING GENERATORS AND SYNCHRONOUS MOTORS. rif 6 
apparent resistance, at the point B. Draw through B a 
perpendicular until it intersects the no-load saturation 
curve at D, and the voltage thus indicated is the pressure 
of the generator loaded with 26 amperes phase current 
with a power factor of zero (cos p= 0). 
This operation carried out for different field currents, gives 
the full load characteristic for a power factor cos p= 0. 
133. Rule for Calculating the Non-Inductive Regu- 
lation.—The inherent regulation of the generator on 
Fie. 38.—GRAPHICAL DETERMINATION oF LOAD M.M F. wirt 
GIVEN No-Loap AND REACTANCE M M.F.’S For 
DIFFERENT PowER FACTORS. 
non-inductive load for any current at any power factor, 
can be easily determined by remembering the following 
rule: 
The reactive ampere turns of the armature, A B* in Fig. 37, 
corresponding to the field excitation O A and obtained by 
the method described in Par. 132, are the sides of a 
triangle in such a form, that the reactive ampere turns as 
one side encloses with the third side an angle, which corre- 
sponds to the value of the power factor. 
