MARCH 29 1902. A MOTOR SLED. A NEW WATER-LEVEL REGULATOR FOR STEAM BOILERS. THE CURTIS WATER-LEVEL REGULATOR—GENERAL VIEW AND CROSS SECTION. AUTOMOBILE NOVELTIES. BATTERY-TESTING VOLTMETER. PLUG SWITCH FOR IGNITION CIRCUIT. THE REASON AUTOMATIC AIR PUMP FOR STEAM CARRIAGES., scientific american, 1902-03-29

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