When his second son Harold was killed in an airplane crash two years ago, Inventor Miller Reese Hutchison (dictograph, klaxon horn, acousticon) resolved to make some contribution to safety and efficiency of aircraft. Last week Dr. Hutchison, onetime (1913-17) chief engineer and personal representative of Thomas Alva Edison, brought forth his offering: "Moto-Vita," a device which measures the unburned gases in engine exhaust, enables a pilot to adjust his carburetor accurately in flight for complete combustion of fuel and, consequently, elimination of waste. Capt. Frank Monroe Hawks tried the Moto-Vita on a...

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