Speaking Trumpet

Speaking Trumpet

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Credit: Universal History Archive/UIG/SCIENCE PHOTO LIBRARY

Caption: Using a speaking trumpet to communicate on deck of a ship. Within limits, the larger the trumpet the further the voice will carry. From ''Natural Philosophy'' by A. Ganot, London, 1887.

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Keywords: 1880s, 19th century, a ganot, london, natural philosophy, physical, physics, sound, speaking trumpet, steam power, uk, united kingdom

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