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 121
eater than withangles or channels. Materials Used for Panels. Various materials have been triedfor the construction of switchboard panels, even including wood,brick, and cement, but slate and marble are the materials most used. 105 8 SWITCHBOARDS Mdrhlc. jNIarble has been used a great deal because… … Fig. 5. An Assembly of Switchboard Fittings for FrameworkCourtesy of General Electric Company engineers now recommend that high voltages be removed from theswitchboard entirely. Marble has one marked disadvantage; itabsorbs oil and grease rapidly, and there is no way of removing thestains…
Electrical engineering
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