Small lens clock

Catalogue Number: 1132
Small lens clock
Category: Equipment
Sub-Category: Lens measure, lens clock
Year Of Publication/Manufacture: c1915
Time Period: 1900 to 1939
Place Of Publication/Manufacture: United Kingdom
Description Of Item: Small lens clock to measure spectacle lens surface curvature, calibrated in Dioptres ( + & - 0 to 10). Chromed brass & glassMarked: BRITISH MADE/ ENG. PAT. 28764.11/ USA APRIL 20 15/ BREVETTE/ DRP. Diam: 3.7 cm
Historical Significance: BREVETTE / DRP means 'Patented Deutsches Reichspatent'. Another example of this lens measure is at cat no, 2903.
Condition: Very good
Location: Archive office. East wall shelves unit 3. Drawer 1

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