3 APPROXIMATE ECONOMY OF GAS AND ELECTRIC LIGHTING. THE CORUNDUM MINES OF NORTH CAROLINA. WHY THE THUNDERER'S GUN BURST. ARTIFICIAL ICE SKATING RINK NEW YORK. Test Trials of Steam Engines. A Belgian Prize. Melting Street Snow by Steam. New Astronomical Instruments. A New Use for the Telephone., scientific american, 1880-02-21
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