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MANUFACTURING AND DISPENSING EQUIPMENT
Europe: United Kingdom
Mid 20th c.
diameter: 250 mm
Double-sided black and white plastic rotating lens surface calculation device with revolving transparent cursor. Obverse = white scale for lens power, black outer scale for inner optic radius. Reverse = features three rotating sections, white outer scale for trial lens power, black inner scales for spectacle/contact lens power and addition.
Gift of Mr Bill Nissel, 2003