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
Fig. 103. Metal Molding and Fittings for requiring good electrical continuity and grounding will be ex-plained later when the subject of conduit is considered. Concealed Work. This kind of wiring is also often called knoband tube work since the wires are held on knobs and passed throughtubes of…
Electrical engineering
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