36 A Steamer Runs Down a Lock Gate. REPAIRING SPIRAL SPRINGS. Copper-plating on Zinc EDISON'S ORE SEPARATOR. The Largest Sheets of Plate Glass in the World. Testing Alcoholic Liquors. Progress in Rifle Shooting. IMPROVED CARTRIDGE. A Georgia Meteor. MENDING BROKEN SPIRAL SPRINGS, scientific american, 1880-07-17
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