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'Colour Test 53': wooden box with sliding coloured 'windows' and rotating dial

'Colour Test 53': wooden box with sliding coloured 'windows' and rotating dial

1945-1965
Four pads of pseudoisochromatic plates record sheets (second edition) by American Optical Company

Four pads of pseudoisochromatic plates record sheets (second edition) by American Optical Company

1957
Wooden box made to hold 48 discs of colour matching test and 16 spare yellow discs

Wooden box made to hold 48 discs of colour matching test and 16 spare yellow discs

1900-1970
Colour matching test, homemade, with case and extra yellow discs. (BPS Inv. No. 0078.)

Colour matching test

Colour matching test comprised of 16 red, 16 yellow and 16 blue-coloured discs (48 total), homemade, numbered on back in black and red ink..

Colour matching test comprised of 16 red

'Colour Test 55': black, wooden box with 3 coloured cards, crudely made, perhaps for testing for differences in binocular sensitivity to colour, 1940-1955. (BPS Inv. No. 0153)

'Colour Test 55': black

1940-1955
A test for defective colour vision, electromechanical counter in 'home-made' wooden box, 1955-1975. (BPS Inv. No. 0073)

A test for defective colour vision

1955-1975