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Gulden, R. O.; C. W. Dixey & Son Ltd
North America: USA, Pennsylvania, Elkins Park
overall (large chart): 281 mm x 165 mm; overall (small chart): 144 mm x 108 mm
Two calibration scales for tonometers, affixed to each other. American chart for 1955 printed on large laminated white card, as approved by the Committee on Standardization of Tonometers of the American Academy of Ophthalmology and Otolaryngology. Includes hanging hole. British chart for 1954 printed on a small slip of white paper.
Gift of Glasgow Caledonian University, 2012