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 Phil

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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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Photo credit: © Universal History Archive/UIG/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: 1880s, 19th, century, ganot, kingdom, london, natural, philosophy, physical, physics, power, sound, speaking, steam, trumpet, uk, united