Improved Gage Cock for Steam Hollers. GERHART'S IMPROVED WAGON BRAKE. The Erie Canal Locks.Lockport. Seals of Alaska. Walrus Hunting. The Knoxville Cave. GERHART'S WAGON BRAKE. QIIINBY'S GEOMETRICAL ARCHING BRICKS. PAINTER'S GAGE COCK FOR STEAM BOILERS., scientific american, 1872-02-17
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