rule; opticians

Description
Five opticians boxwood rules with brass fittings.
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Object detail

Department
Object
Signature & date
01 "The international curl side rule if used for ball end sides deduct 1/16 in Reg No. 622908 also guaranteed scales"
02: Orthops rules ....
03: various scales in millometers, inches ovales and a circle
04: "Freemans refractionists rule patent applied for "stamped on brass fitting.
Measurement type, part and reading
Dimensions:01:W 4.6 L 15.3cm (W 1 13/16 L 6")
Dimensions:02:W 5.5 L 23cm (W 2 3/16 L 9 1/16")
Dimensions:03:W 6 L 16.1cm (W 2 3/8 L 6 5/16")
Dimensions:04:W 4.8 L 18.9cm (W 1 7/8 L 7 7/16")
Dimensions:05:W 6.6 L 16.6cm (W 2 5/8 L 6 9/16")
Accession number
1994-039-017

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