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 412
on, when the contacts close,and the pressure is applied by a hand or a foot lever. Specialmachines are also made for rail welding, etc. (See Figs. 104 and 107.) 868 WELDING 75 Source of Power. A. C. City Circuits with Transformer. Thesource of power for butt and spot welders should have the same… … Fig. 98. 24-Inch Drop Arm Spot Welder Showing Different Positions of Universal Points Courtesy of National Electric Welder Company transformer, to give current at the desired voltage, will be furnishedto power users. City distribution circuits are usually operated at2200 volts in order to reduce…
Electrical engineering
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