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 122
Fig. 47. Electric Rock DrillCourtesy of Fort Wayne Electric Works r^\ … Fig. 48. Partially Dismounted Rock Drill Showing Electrical Hammer Mechanism Courtesy of Fort Wayne Electric Works force and at each revolution strikes a blow upon the projecting headof the drill steel cap, which in turn delivers the energy of the blowto the drill steel. 105
Electrical engineering
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