Empire datum frame rule

Catalogue Number: 3551
Empire datum frame rule
Category: Equipment
Sub-Category: Dispensing tool
Year Of Publication/Manufacture: c 1950
Time Period: 1940 to 1999
Description Of Item: Datum frame rule, steel, 202 mm x 72 mm, with scales engraved on the base plate to measuring eye size and locating lthe optical centres and bifocal height to be measured in relation to the datum line. Marked EMPIRE DATUM FRAME RULE / COPYRIGHT Engraved Rob Kaye on both faces.
Historical Significance: This may have been made by M Wiseman and Company Ltd, a UK optical supply house. The book L S Sasieni Spectacle fitting and optical dispensing 1950 (Cat nos 776 )2243) has an informative chapter (ch 2) on frame rules and one (ch 5) on devices for face measurements. This is the same as the base of Cat. No. 2237
How Acquired: Donated by Robert Kaye
Date Acquired: 4-3- 2014
Condition: Good
Location: Archive office. East wall shelves unit 3. Drawer 10

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