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 252
of seat, unless under side ofseat is protected by not less than \ inch fire-resisting insulating material,or .04 inch sheet metal with 1 inch air space over same, when the dis-tance may be reduced to 3 inches. Truss plank heaters to be mounted on not less than \ inch fire-resisting insulating… … <oPi oo H s ^^^1 a*gl > 2 i> O s> U 2 O ■K ^ § O1/1 a, ELECTRIC RAILWAYS 123 (h) Air Pump Motor and Circuits (1) Circuits to be run in approved metal conduit or in approvedmolding, except that when run below the floor of the car they may besupported on porcelain knobs or cleats, provided the…
Electrical engineering
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