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Bennett Slide Rule
CONTACT LENSES AND ACCESSORIES
slide rule
G. Nissel & Company Ltd
Europe: United Kingdom, England
1950s?
plastic
rule: 5 x 540 x 50 mm; case: 25 x 545 x 92 mm
2003.303
CONTACT LENSES AND ACCESSORIES
slide rule
G. Nissel & Company Ltd
Europe: United Kingdom, England
1950s?
plastic
rule: 5 x 540 x 50 mm; case: 25 x 545 x 92 mm
Black plastic slide rule with printed white 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). In hinged white leatherette-covered wooden case with green baize lining and two yellow metal clasps.
2003.303
Ex Keeler Collection