Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 150
which forms a support for the field coil and at thesame time serves to increase the pole surface. The field coils are wound of copper strap insulated with asbes-tos and mica and thoroughly taped. Oiled duck is also used tofurnish good mechanical protection against chafing. Many usershave the coils… … Fig. 33. Main and Interpole Field Coils are pressed firmly between these washers by flat steel springsplaced between them and the case; thus they are not permitted
Electrical engineering
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