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Secret voice for war or peace Title: Secret voice for war or peace
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Two-way radio on wheels talks with airships Two-way radio on wheels talks with airships
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Popular Mechanics, v. 60, n. 2, 1933
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Popular Mechanics, v. 75, n. 1, 1941
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Popular Mechanics, v. 74, n. 6, 1940
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Popular Mechanics, v. 74, n. 5, 1940
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Popular Mechanics, v. 74, n. 4, 1940
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Rifle shoots twelve bullets a second
Rifle shoots twelve bullets a second
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Three tripods support mast of modern warship Three tripods support mast of modern warship
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Giant oil engines propel latest submarine Giant oil engines propel latest submarine
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The army on wheels The army on wheels
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Popular Mechanics, v. 60, n. 1, 1933
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Cardboard planes test aim of anti-aircraft gunners Cardboard planes test aim of anti-aircraft gunners
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Model range for artillery teaches young officers Model range for artillery teaches young officers
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Plane fueld made from coal tested in Great Britain
Plane fueld made from coal tested in Great Britain
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Silent machine gun is "fired" by electromagnets Silent machine gun is "fired" by electromagnets
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Popular Mechanics, v. 59, n. 6, 1933
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Rifle firing bullet of light aids army recruits Rifle firing bullet of light aids army recruits
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Recruits ride dummy horses to gain confidence Recruits ride dummy horses to gain confidence
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Latest army bomber has glass gun turret Latest army bomber has glass gun turret
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High or low warfare in the sky High or low warfare in the sky
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Boiler controls are "nerves" of modern cruiser Boiler controls are "nerves" of modern cruiser
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Eight wheels on army truck each find own level Eight wheels on army truck each find own level
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Popular Mechanics, v. 59, n. 5, 1933
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Dive bombing at targets assures accuracy Dive bombing at targets assures accuracy
