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illuminated test chart
Europe: United Kingdom, England, London
overall: 333 mm x 305 mm
Accessory panel for a Turville Infinity Balance, comprising cream-painted metal panel on which are positioned two black dots and two black triangles. The left dot and triangle are adjustable laterally by a manual control. The right dot is adjustable laterally by means of manually-operated pneumatic trigger.
Gift of Mr John Dixon Salt FCOptom, 2016