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Nissel (Bennett) contact lens slide rule
CONTACT LENSES AND ACCESSORIES
slide rule
G. Nissel & Company Ltd
Europe: United Kingdom, England
1960s?
plastic
rule: 5 x 505 x 51 mm

White plastic slide rule with printed scales. Upper scale denoting centre thickness and outer optic radius. Centre scale denoting nominal front surface power. Reverse side comprises two columns of figures (for optic radius and surface power).


2004.97

Gift of Mr Bill Nissel, 2003



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