JULY 7 1877. IMPROVED SHOT BAG AND CHARGER. 4 A NEW HOT-AIR ENGINE. HOCK AND MARTIN'S HOT-AIR ENGINE. in this manner by the escape of cold air the pressure in I II I. 4 IMPROVED PRESSURE GAUGE. zinc in the bath and one of any thickness by the aid of the battery., scientific american, 1877-07-07
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