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 258
n holes bored in the wood andjust large enough for the tubes. In general we may say that knobs are used where the wiresrun parallel with floorbeams, and tubes wherethe wires are run at rightangles to the beams.Fig. 105 shows the gen-eral method and Fig. 106illustrates a two-pieceknob. These are… … Fig. 106. Two-Piece Knob for Holding Wire 230 UNDERWRITERS REQUIREMENTS 107 everywhere 5 inches apart. Fig. 107 shows clearly the use of theknobs and tubes, but the tubing shown on two of the upper wires
Electrical engineering
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