Topophone

The aim of the topophone, which was invented and patented by Professor A. M. Mayer, last winter, is to enable the user to determine quickly and surely the exact direction and position of any source of sound. Our figure shows a portable style of the instrument; for use on ship-board it would probably form one of the fixtures of the pilot-house or the "bridge," or both. In most cases arising in sailing through fogs, it would be enough for the captain or pilot to be sure of the exact direction of a fog horn, whistling buoy, or steam whistle; and for this a single aural observation suffices.
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Scientific American, Vol. XLIII.--No. 1. [New Series.], July 3, 1880
A Weekly Journal Of Practical Information, Art, Science,
Mechanics, Chemistry, And Manufactures
Available from www.gutenberg.org
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