AN INEXPENSIVE AIR PIMP. BY GEO. M. HOPKINS. 1TESTING SIMPLE AIR PUMP. inch rubber tubing and the 1 inch tubes are placed in 6VALVE FOR COMPRESSION PUMP. Drying Lp of Great Lakes. Bronsidia. 2LONGITUDINAL SECTION OF SIMPLID AlR PUMP. 3VALVE CASING PARTLY IN SECTION., scientific american, 1886-09-18
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