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Popular Science 1941-12

Popular Science 1941-12.jpg Photoplay 1930-02ThumbnailsScientific American 1928-10Photoplay 1930-02ThumbnailsScientific American 1928-10Photoplay 1930-02ThumbnailsScientific American 1928-10Photoplay 1930-02ThumbnailsScientific American 1928-10Photoplay 1930-02ThumbnailsScientific American 1928-10

Air defense guards listening for approaching planes using an acoustic amplifier / sound collector. "Guarding Our Coasts Against Night Bombers," and "Tanks Can Be Destroyed."



Source: Horton Family, Noblesville, Indiana

Restoration by: magscanner