THE CONTINUOUS CURRENT GENERATOR 105 



erator is shown in Fig. 61. It is seen that the coil is made 

 in two parts. The outside coil of few turns is the series 

 field; it is noticed that the terminals which lead the current 



(a) 



(b) 



(c) 



FIG. 60. Various Field-circuit Connections; a, Shunt Field; 6, Series 

 Field; c, Compound Field. In c the short shunt connection in 

 dotted lines. 



in and out of this coil are heavily constructed so as to 

 carry safely a large current. The current through a series 

 coil may be several hundred amperes on a large machine. 



FIG. 61. View of a Field Coil for a Compound Generator, 

 house Elec. and Mfg. Co. 



Westing- 



Field Rheostats. In series with the shunt field of any 

 generator is generally placed a variable resistance (see Fig. 

 62), made of some high resistance material imbedded in 

 enamel, porcelain, or other heat resisting body. The amount 



