Mechanical movements, powers, devices and appliances (1901)
Hiscox, Gardner Dexter, 1822?-1908 · New York, N. W. Henley & company · leaf 309
1207. MULTIPLEX BUTTERFLYVALVE, for ventilating shafts. 300 MINING. … 1208. STEAM-DRIVEN VENTI-LATING FAN.—Type of those used inthe coal-mining districts. The fan wheelmay be encased in an iron or wooden shell. 1209. MINERS SAFETY LAMP.—The flameis surrounded with wire gauze and a double wiregauze cap. In explosive mine gases, the firing ofthe incoming air and gas…
Mechanical movements
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