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test chart accessory
American Optical Corporation
North America: USA, New York, Buffalo
Mid 20th c.
overall (box): 50 mm x 322 mm x 66 mm; slide: 175 mm x 35 mm; slide 11179: 308 mm x 41 mm; slide 1217-5D: 308 mm x 41 mm
Three interchangeable slides from a projection test chart. White metal, with transparent panels featuring various test charts including a Snellen chart and Landolt rings. Together with its original cardboard box, with lid printed in red and white.
Gift of Mr Martin Ruddy, FCOptom, 2013