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Cards for use with a Pigeon-Cantonnet Stereoscope
ORTHOPTIC INSTRUMENTS
stereoscope card
1930s
card

Set of two stereoscope cards depicting a coloured image of a bawling soldier in a helmet against a black background with, below it, a downward-pointing arrow. For use in conjunction with a stereoscope to demonstrate simultaneous vision for colour.


1999.4119

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