Wiring diagrams of electrical apparatus and installations (1913)
McGraw-Hill · New York, McGraw-Hill Book Company · leaf 157
Fig. 229.—Two plates of the type shown in Fig. 228 connected in series. 146 WIRING DIAGRAMS OF ELECTRICAL APPARATUS … Fig. 230.—Connections of a two-arm dial rheostat resister. This rheostat is equippedwith two arms, one short and one long; the short one connects the line with the inner circle ofcontact buttons, while the long one is insulated from the short one and connects the outercircle with the intermediate…
Electric wiring
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