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Vertex Distance Conversion Calculator
MANUFACTURING AND DISPENSING EQUIPMENT
slide rule
Association of Dispensing Opticians; Stanleigh Rule Co.
Europe: United Kingdom, England, Buckinghamshire, Slough
1960s
plastic
overall: 146 mm x 146 mm

Conversion slide rule for calculating vertex distance of lens prescriptions, comprising a round piece of plastic with inner rotating disc and millimetre scales for plus and minus lenses. Directions for use printed on the reverse.


2013.269

Gift of Mr Brian Mitchell, 2013



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