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'Bondwell' opticians slide rule
C. W. Dixey & Son Ltd
c.1905
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Aristo 80148 optician's slide rule / Rechenstab fur Optik
Dennert & Pape
20th c.
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Aristo slide rule and case
Dennert & Pape
20th c.
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Bennett Slide Rule
G. Nissel & Company Ltd; Blundell Harling Ltd
1970s?
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Bennett Slide Rule
G. Nissel & Company Ltd
1950s?
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Bennett Slide Rule
G. Nissel & Company Ltd
1960s?
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circular slide rule for contact lens surfacing calculations
Mid 20th c.
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contact lens measuring rule
Johnson & Johnson Medical Ltd
2010
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contact lens measuring rule
American Optical Co
Late 20th c.
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contact lenses slide rule
Lunelle Soft Contact Lenses
Early 1990s
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CSI Polycon - Vertex Distance Conversion
Syntex Ophthalmics Inc
1980s
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DuraSoft Optifit Toric - Vertex Distance Conversion
Wesley-Jessen Inc
December 1996
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Lunelle Soft Contact Lenses rule
Essilor; Lunelle Soft Contact Lenses
1980s
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Nissel (Bennett) contact lens slide rule
G. Nissel & Company Ltd
1960s?
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ophthalmic slide rule
Nitsche & Gunther
mid 20th c.
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optometrist's slide rule
Carl Zeiss (Jena)
20th c.
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Orthops Rule
Raphael's Ltd
20th c.
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Orthops Slide Rule
Raphael's Ltd
2nd quarter 20th c.
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Orthops Slide Rule
Raphael's Ltd
2nd quarter 20th c.
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Orthops slide rule
Raphael's Ltd
2nd quarter 20th c.
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Orthops Slide Rule
Raphael's Ltd
Mid 20th c.
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Orthops Slide Rule
Mid 20th c.
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Orthops Slide Rule used at Heriot Watt College
Raphael's Ltd
Mid 20th c.
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Polycon II Initial Fitting Guide
Sola-Syntex Ophthalmics
Post 1985
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Prototype Ridley Slide Rule
Keeler
1948
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Quadrante 74 slide rule
Lozza
Late 20th c.
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Syze rule
Raphael's Ltd
1930s?
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Vertex Distance Conversion Calculator
Association of Dispensing Opticians; Stanleigh Rule Co.
1960s
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Vertex Distance Conversion Disc
Rayner
Mid 20th c.
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Vertex Slide Rule
Obrig Laboratories (Great Britain) Ltd
1960s?
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