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The 'Optrex' Rule
MANUFACTURING AND DISPENSING EQUIPMENT
datum rule
John Baird & Sons
Europe: United Kingdom, Scotland, Strathclyde, Glasgow
Early-Mid 20th c.
plastic
overall: 75 x 172 mm

White plastic optician's datum rule. Various scales marked in black on both sides, including lens protractor, standard sizes for oval lenses, panto-oval lenses (v-edged or rimless), circular lenses, pupillary distance, bridge height and spread (nasal width).


2005.208

Gift of Essex County Hospital, 2005



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