STANDARl' <>h Hi 



( >n motors, induction generators. frequency 

 lary phase cor 



18 i > m which the 



rs maintains the same direction 

 i respect to those conductors. 



39 K J i n , i -.. ' i . i > <RNRRATORf 



40 I i i i MI IMA i n .\i-\- \> as condensers, etc. 



41 i 





42 I LRC IKOTMKMMAL APPAR 



42. i 





1- APPARA 



43 I K APPAMV i 2i> fair* breakers, Iifhtniof 



44 



iay, for convenience, be classified with reference to their speed 

 characteristics as follows: 



46 Ahich the S;HT,I is either constant or 

 does not uch as is motors, induction motors 



ton. 



47 ' OTORS (two-speed. thr< .in be 



x- speeds being ; 



windings, 

 or number of poles. 



48 i - can be varied grad- 

 ually over a considerable range; but when once remains prac- 



.lly unaffected by the load, such as shunt motors devigned for a con- 

 siderable r ion. 



49 d VAKMN<. -i i i o or motors in which the speed varies with 

 the load, decreasing when the load increases: such as series motors. 



: \STRfMENTS. 



49a As AMMI -is . nt-nu-asur licating in amperes. 



49b .tge- measuring instrum< *in^ in volts. 



>wer. and 

 in in w.i 



49d KKCUKDING AMMETERS, VOLTMETIK METKRS. etc.. are instru- 



s which record graphically upon a time-chart the values of the qnaa* 



tit: 



49e A V K METER is an instrum. ng total watt- hours. 



This term is to be preferred to the term -ing wattmet< 



49f MKTBR COMPENSATOR is a device in connection with a 



meter, which causes the latter to indicate the voltage at some otb-r point of 



the circuit. 



49g IKOSCOPE is a synch: < which, in . Mition to 



K- synchronism, shows whether the machine to be yn hronr 



fast or slow. 



G. DEFINITION A OP TKP 



(I) LOAD FACTOR. 



60 The LOAD FACTOR of a machine, plant or system is the rat '. the 

 average power to the maximum p< ng a crrtain period of :>me. 

 The average power is n period of time, such as a dajr 

 or a year, and the maximum is taken over .1 iterval of the maxi- 

 mum load within that 



61 In -.-. h case the interval of maximum load should be definitely speci- 

 fied. The pn>jei tally dependent upon local and 

 upon the purpose for which the load factor is to be determined. 



