Anti-aircraft device, First World War, 1914-1918, (c1920). Creator: Unknown
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Anti-aircraft device, First World War, 1914-1918, (c1920). Creator: Unknown
Anti-aircraft device, First World War, 1914-1918, (c1920). The War against German Aircraft: a " Listening Post" in the French anti-aircraft Section. These listening posts in the French army consist of four huge horns, which gather up the slightest sound and magnify it by means of a microphone, so that it is impossible for an enemy or other aviator to approach unheard. The horns may be described as reverse megaphones. From " The Great World War - A History" Volume IV, edited by Frank A Mumby. [The Gresham Publishing Company Ltd, London, c1920]
Media ID 19174435
© The Print Collector/Heritage Images
Anti Aircraft Unit Device Frank Arthur Frank Arthur Mumby Gresham Publishing Co Ltd Gresham Publishing Company Horn Innovation Keystone Archives Megaphone Microphone Mumby Mumby Frank Arthur Sound The Great World War A History
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