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 371
not the block is clear. The lamps areplaced in a weatherproof box with a glass window. Red glass issometimes used to suggest danger. A double-throw switch is con-nected with the lamps at each terminal of the section, as shown inthe figure. The switches have no central position, the knife… … Fig. 215. Sit?nal Box—White DiskDisplayed Fiff. 216. Signal Box with FrontCover Down ing either one of the switches. A motorman on reaching a sectionof track, finding the lamps not burning, throws the switch. Lampsnow burn in each switch box and show that the section is in use.On arriving at the…
Electrical engineering
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