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Seg-Determinator
MANUFACTURING AND DISPENSING EQUIPMENT
bifocal segment measure
Pell Optical Co; London Optical Company Ltd
Europe: United Kingdom
20th c.
plastic; paper
measure: 42 x 13 mm; wallet: 53 x 94 mm; leaflet: 190 x 86 mm

Set of four perspex scales measuring 36, 38, 40 and 42mm in depth, engraved with datum line and a perpendicularly placed graduated millimetre scale. In black imitation leather wallet with flap fastening. Also an instruction leaflet authored by Neville Chappell.


2003.206

Gift of the Essex County Hospital, 2003



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