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A SHORT HISTORY OF ACOUSTIC LOCATORS
the image above is an illustration of brantz (or is it alfred?) mayer’s topophone, an acoustic location device invented in 1880 to find the position of ships in fog. the horns not only amplified sound, but because of the distance between them, increased the user’s ability to pinpoint the sound’s direction. acoustic locators were later widely used to pick up the distant rumble of aircraft engines — until the invention of radar during world war II rendered them all but obsolete. below is a photograph of emperor hirohito touring japanese war tubas. 
these images come from a terrific page dedicated to acoustic location and sound mirrors.
the image above is an illustration of brantz (or is it alfred?) mayer’s topophone, an acoustic location device invented in 1880 to find the position of ships in fog. the horns not only amplified sound, but because of the distance between them, increased the user’s ability to pinpoint the sound’s direction. acoustic locators were later widely used to pick up the distant rumble of aircraft engines — until the invention of radar during world war II rendered them all but obsolete. below is a photograph of emperor hirohito touring japanese war tubas. 
these images come from a terrific page dedicated to acoustic location and sound mirrors.
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