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 218
e back of lathing to hold tubes, and to support switches orfixtures. When this cannot be done, wood base blocks, not lessthan 5 inch in thickness, securely screwed to lathing, must be pro-vided for switches, and also for fixtures which are not attached togas pipes or conduit. Figs. 62 and 63 show… … - STUDDING
Electrical engineering
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