90 ELEMENTS OF ELECTRICAL ENGINEERING. 



posts, and it is mounted in a convenient position on the switch- 

 board panel. 





Fig. 70. 



In the rheostat manufactured by the Ward- Leonard Company, 

 the zigzags of resistance wire are embedded in a thick layer ot 

 glazing or enamel on the back of a deeply-ribbed cast-iron plate. 



50. Adjustment of a compound generator. A compound gen- 

 erator always has a low resistance shunt, usually made of Ger- 



