Alethoscope

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]

References

↑ http://www.thefreedictionary.com/Alethoscope
↑ Hannavy, John (2007). Encyclopedia of Nineteenth-Century Photography. New York: Routledge
↑ Magic visions before the advent of the cinema by Carlo Alberto Zotti Minici ISBN 9788871152998

External links

Image of an alethoscope advertisement

Precursors of film
Alethoscope Anorthoscope Camera obscura Chronophotography Electrotachyscope Flip book Kaiserpanorama Kinematoscope Kinetoscope Magic lantern Megalethoscope Mutoscope Peep show Phantasmagoria Phenakistiscope Praxinoscope Shadow play Stereoscope Thaumatrope Théâtre Optique Zoetrope Zograscope Zoopraxiscope

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Terminology	35 mm equivalent focal length Angle of view Aperture Black and white Chromatic aberration Circle of confusion Color balance Color temperature Depth of field Depth of focus Exposure Exposure compensation Exposure value F-number Film format Large Medium Film speed Focal length Guide number Hyperfocal distance Metering mode Orb (optics) Perspective distortion Photograph Photographic printing Photographic processes Reciprocity Red-eye effect Science of photography Shutter speed Sync Zone System
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