Wiring diagrams of electrical apparatus and installations (1913)
McGraw-Hill · New York, McGraw-Hill Book Company · leaf 164
s^o/^ … Fig. 245.—Connections for a two-step self-starter operated by a pressure regulator. Thecontrol circuits are shown at the left, 1, 2 and 3 representing the solenoids; ai, a-i, and as thecorresponding contact pieces above the plungers; r, resistances. The pressure governor is asort of a pressure gage…
Electric wiring
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