Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 256
loads. 222 ELEVATORS 173 The controller as usually arranged consists of banks of resist-ance mounted on one side of a marble or slate slab, Fig. 125, on theopposite side of which are arranged the various solenoids and switchesby means of which the different operations above described are car-ried… … Direct-Current Semi-Magnet Controller for Hand Cable andLever Control Operation.Courtesy of Kaestner and Hecht Company best switchboard material on account of its perfect insulating quali-ties, although slate is equally as good if free from streaks of metal,the presence of which will prove fatal to…
Electrical engineering
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