International Library of Technology · Scranton, International Textbook Co. · leaf 349
e e. Fig. 14, although not drawnto scale, will give an idea as to the relation of the pole piece C,drum D, and the controller back E when the pole piece isswung into position. The pieces d are aic guards, andare made of vulcabeston (vulcanized asbestos); they passbetween the contact arcs and… … Controller BacifFIG. 14. When the drum is revolved far enough, the tip x of contactarc k leaves finger f and an arc tends to form. This arcacts in the same way as a flexible wire carrying current, i. e.,it is forced across the field just as the conductors on thearmature of a motor are forced to…
Electrical engineering
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