THE CONTINUOUS CURRENT MOTOR 



183 



formed. This feature of the controller is called the mag- 

 netic blow-out. Also the segment tips and fingers are so 

 made as to be easily replaced by new ones when they have 

 been burned so much as to be unserviceable. 



FIG. 110. Inside View of Railway Controller. 



39. Use of a Flywheel with a Compound Motor. The 

 rate at which power is required by 'some kinds of machine 

 tools is very irregular; in the punch press or forming press 

 for example almost no power is required until the die comes 



