Small lens measure

Catalogue Number: 2903
Small lens measure
Category: Equipment
Sub-Category: Lens measure, lens clock
Year Of Publication/Manufacture: 1915
Time Period: 1900 to 1939
Place Of Publication/Manufacture: Britain
Description Of Item: Small glass-faced lens measure for measuring the curvature of the front and back surfaces of ophthalmic lenses, 36 mm dia. 9 mm deep. Made of chromed brass and glass with white clock face under the curved protective glass cover with black dioptre scale from ? 10 D, with black rotating pointer. Three pins under protective metal cover and metal loop for attaching a chain or cord. Marked ' BRITISH MADE / ENG PAT. 287642.11 / USA APRIL 20 15 / BREVETTE / DRP'
Historical Significance: BREVETTE / DRP means 'Patented Deutsches Reichspatent'. Another example of this lens measure is at Cat no. 1130.
How Acquired: Donated by Estate of William Cooper, via Peter Lewis
Date Acquired: April 2016
Condition: Very good except for loss of chrome plating along part of top edge and scale does not zero
Location: Archive office. East wall shelves unit 3. Drawer 1

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