An alethoscope (Greek true+view) is an instrument for viewing pictures with a lens to enlarge and show them with natural relations and proportions.[1] The alethoscope was invented by Carlo Ponti in 1860 and patented in 1861.[2] It was used to view photographs that were colored, perforated and mounted on a curved frame. The alethoscope showed day-and-night effects whether viewing it against the light or reflect the light by two side mirrors. It is the larger version of a megalethoscope.[3]


  2. Hannavy, John (2007). Encyclopedia of Nineteenth-Century Photography. New York: Routledge
  3. Magic visions before the advent of the cinema by Carlo Alberto Zotti Minici ISBN 9788871152998

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