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Pistol shoots phonograph-needle darts Pistol shoots phonograph-needle darts
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Small marine searchlight uses gas-bulb lamp Small marine searchlight uses gas-bulb lamp
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Miniature rifle range has automatic targets Miniature rifle range has automatic targets
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Latest ideas in dirigibles typified in "R-80" Latest ideas in dirigibles typified in "R-80"
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The mechanism of war on duty in Ireland The mechanism of war on duty in Ireland
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The submachine-gun magazine The submachine-gun magazine
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Spanish cradle ship for submarine repairs Spanish cradle ship for submarine repairs
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Sixteen-inch disappearing gun is completed Sixteen-inch disappearing gun is completed
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Emergency anti-aircraft gun mounts of the bolshevists Emergency anti-aircraft gun mounts of the bolshevists
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Popular Mechanics, v. 36, n. 5, 1921
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Popular Mechanics, v. 36, n. 4, 1921
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Popular Mechanics, v. 36, n. 3, 1921
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Popular Mechanics, v. 36, n. 2, 1921
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Popular Mechanics, v. 36, n. 1, 1921
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Popular Mechanics, v. 35, n. 5, 1921
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Popular Mechanics, v. 35, n. 4, 1921
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Popular Mechanics, v. 35, n. 3, 1921
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Popular Mechanics, v. 35, n. 2, 1921
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A radio accident in the Kiel Canal A radio accident in the Kiel Canal
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Hog Island rudder becomes regular repair unit Hog Island rudder becomes regular repair unit
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strange concrete battleships built on ocean's floor strange concrete battleships built on ocean's floor
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Popular Mechanics, v. 35, n. 1, 1921
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Le armi dei nuovi alleati Le armi dei nuovi alleati americani
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La Domenica del Corriere, a. XIX, n. 21, 1917 Matteo Treverzoli
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"Mosquitos" contro i sommergibili "Mosquitos" contro i sommergibili
