Arthur S. Denny's steam organ, the Calliope, exhibited in the main transept of the Crystal Palace, London. From ''The Illustrated London News'', London, 1859.

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Photo credit: © Photo12/Ann Ronan Picture Library / Alamy / Afripics
License: Licensed
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Keywords: ., 19th, arthur, calliope, century, crystal, denny, engraving, instrument, london, musical, organ, palace, physics, power, sound, steam