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illuminated test chart; bi-chromatic test
R. Archer & Sons Ltd
Europe: United Kingdom, England, London
Mid 20th c.
wood; metal; plastic
overall: 225 mm x 355 mm x 150 mm
Silver-painted wooden wall-mounted lightbox with illuminable panels of Landolt rings (with red and green backgrounds) and Verhoeff's circles (with white, green or red backgrounds). Black electric flex with switch unit intneded to be suspended from a hook beneath the instrument.
Gift of Mr John Dixon Salt FCOptom, 2016