Henry and Hora's modern electricity; a practical working encyclopedia (1915)
Henry, James. [from old catalog], Hora, Karel Jan, 1881- [from old catalog] joint author · Chicago, Laird & Lee, inc. · leaf 142
Fig. 46. annealed charcoal iron, thebeing nearly 12 inches, and outer diameter of each diskits inner diameter 9. Thinpaper insulates eachdisk from its neigh-bors. The armature ismounted on a steelshaft, to which iskeyed a non-magneticgunmetal spider withfour arms, the ends ofwhich fit into… … Fig. 47.
Electrical engineering
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