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 259
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 … Fig. 107. Knob and Tube Wiring Showing Objectionable Features is objectionable and knobs should have been used instead. It isvery desirable to use metal outlet boxes at all outlets and the addedexpense of so doing is not large. Where flush switches or receptacles 231 108 UNDERWRITERS REQUIREMENTS
Electrical engineering
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