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 346
s from 24to 30 inches in length. They are handled by a helper. Swingsledges, Fig. 10, weigh from 8 to 20 pounds and have SG-inch handles.They are used for heavy work only and the helper strikes a blowwith a free full-arm swing. Ball-peen, or chipping, hammers, Fig. 7, have a round top orball-shaped… … Fig. 3. Portable Hand ForgeCourtesy of Canedy-Otto Company
Electrical engineering
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