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Bennett Slide Rule
CONTACT LENSES AND ACCESSORIES
slide rule
G. Nissel & Company Ltd
Europe: United Kingdom, England
1960s?
plastic
rule: 5 x 540 x 50 mm; case: 25 x 545 x 92 mm
2004.98
CONTACT LENSES AND ACCESSORIES
slide rule
G. Nissel & Company Ltd
Europe: United Kingdom, England
1960s?
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 black velvet lining and two yellow metal clasps. Contents in original plastic, as supplied new.
2004.98
Gift of Mr Bill Nissel, 2003