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Air-distance recorder for airplanes Air-distance recorder for airplanes
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New instrument simplify defense gunnery New instrument simplify defense gunnery
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Bed for invalids is easily adjustable Bed for invalids is easily adjustable
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Grounded shield protects tanks from lightning Grounded shield protects tanks from lightning
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Navy's first all-metal plane has no blind spot Navy's first all-metal plane has no blind spot
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Simple device indicates airplane air speed Simple device indicates airplane air speed
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Group of cavalrymen craved entirely in cork Group of cavalrymen craved entirely in cork
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New type ship has double-chilled steel interior New type ship has double-chilled steel interior
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War tank that travels by land or water War tank that travels by land or water
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Army plane flies 90 miles without a pilot
Army plane flies 90 miles without a pilot
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Self-cooling aero engines with complete expansion Self-cooling aero engines with complete expansion
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Inclinometer of unusual accuracy Inclinometer of unusual accuracy
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French quadruplane has original features French quadruplane has original features
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Rifle and shotgun combined in four-barreled gun Rifle and shotgun combined in four-barreled gun
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Magnetic brake designed to stop airplanes Magnetic brake designed to stop airplanes
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Popular Mechanics, v. 40, n. 6, 1923
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Popular Mechanics, v. 40, n. 5, 1923
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Popular Mechanics, v. 40, n. 4, 1923
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Popular Mechanics, v. 40, n. 3, 1923
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Popular Mechanics, v. 40, n. 2, 1923
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Popular Mechanics, v. 40, n. 1, 1923
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Popular Mechanics, v. 39, n. 6, 1923
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Popular Mechanics, v. 39, n. 5, 1923
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Popular Mechanics, v. 39, n. 4, 1923
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Popular Mechanics, v. 39, n. 3, 1923
