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Hand-held colour test
COLOUR VISION TESTS
colour vision test
Early 20th c.?
brass
overall: 111 x 40 mm
2004.604
COLOUR VISION TESTS
colour vision test
Early 20th c.?
brass
overall: 111 x 40 mm
Colour (?) test comprising two rotable brass discs, the foremost featuring five variously-sized apertures and the hindmost bands of colour: red yellow, blue, white, green. Simple metal loop handle.
2004.604
Gift of A. H. Rivron & Son Ltd, 2004