336 



ELEMENTS OF ELECTRICAL ENGINEERING. 



with the circuit leading to the receiving circuit of which the volt- 

 age is to be regulated, and to turn the secondary member through 

 half a revolution would be equivalent to reversing its connections 

 so that the electromotive force generated in the secondary mem- 

 ber could be added to or subtracted from the supply voltage by 

 adjusting the position of the secondary member, thus making the 

 receiver-circuit voltage greater or less than the supply voltage. 

 This form of regulator is usually called the induction regulator. 



Fig. 287. 



It can be arranged to raise or lower the voltages of any num- 

 ber of phases simultaneously, by providing the primary and 

 the secondary members both with polyphase windings. The 

 secondary member in Fig. 287 is supported on the spindle a y 

 and it may be turned into any position by means of the hand- 

 wheel and worm-gear shown in the figure. 



151. The dial synchronizer is a device for causing a pointer to 



