Electrical engineer's pocket-book: a hand-book of useful data for electricians and electrical engineers (1901)
Foster, Horatio A. (Horatio Alvah), 1858-1913 · New York, D. Van Nostrand co.; London, E.& F.N. Spon, ltd. · leaf 505
closing the line supply to one or more independent train wires, each ofwhich operates a relay. This switch has neither mechanical nor electricalconnection of any kind with the motor circuits, nor, although it has certaincorresponding position, is its movement necessarily coincident with,… … FlG. 46. Schematic Diagram of Control Circuits Only, Sprague System. is supplied to each motor, which is the half-speed combination. In goingthence to full speed, the main circuits are first opened instantly at the maincontroller, or, if desired, progressively through resistances and…
Electrical engineering
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