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 123
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… … SWITCHBOARDS 9 Slate. Slate has many advantages over any other materialand is being very widely used for switchboards of all kinds. It isexceptionally strong mechanically, especially the better grades.It is obtainable in a neutral black color which will take an oil finish.Such a finish is not…
Electrical engineering
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