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The Sloan Colour Threshold Tester (CTT)
COLOUR VISION TESTS
colour vision test lantern
Sloan, Dr Louise L.
North America: USA
Post 1944
wood
overall: 240 x 185 x 280 mm
2002.73
COLOUR VISION TESTS
colour vision test lantern
Sloan, Dr Louise L.
North America: USA
Post 1944
wood
overall: 240 x 185 x 280 mm
Colour vision test lantern consisting of a black wooden box with leather carrying handle. Hinged doors at each end provide access to two rotating discs of 8 filters and two control knobs. Internal 60 watt lamp. Black electric flex and modern 3-pin plug.
2002.73
Gift of Professor R.J. Fletcher, 2002