Mechanical movements, powers, devices and appliances (1901)
Hiscox, Gardner Dexter, 1822?-1908 · New York, N. W. Henley & company · leaf 339
1362. BLACKSMITHS HELPER, orfoot helve hammer. Operated by the footon the treadle. Hammer held up by thespring. … 1363. REVOLVING RAPID-BLOW HAM-MER.—The centrifugal aciion of the revolvingarms throws the hammers outward. 1364. HELVE TRIP HAM-MER.—An ancient device yet inuse. The treadle stops the actionof the hammer by disengaging thebell-crank catch b. Used for smallwork. MILL AND FACTORY APPLIANCES. 33^
Mechanical movements
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