Wiring diagrams of electrical apparatus and installations (1913)
McGraw-Hill · New York, McGraw-Hill Book Company · leaf 156
•19 JvYs ■^^ IP/ate Fig. 228.—Connections of a dial rheostat resister arranged with contact buttons, over thesurface of which the contact arm glides. … Fig. 229.—Two plates of the type shown in Fig. 228 connected in series. 146 WIRING DIAGRAMS OF ELECTRICAL APPARATUS
Electric wiring
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