Dioptre-Inch conversion scale

Catalogue Number: 1019
Dioptre-Inch conversion scale
Category: Equipment
Sub-Category: PD ruler, pupillometer
Time Period: 19th C
Place Of Publication/Manufacture: Attleboro, Mass, USA
Publisher/Manufacturer: Bay State Optical Co
Description Of Item: Dioptre-Inch lens power conversion scale. Reverse shows millimetres-English inches conversion scale.'BAY STATE OPTICAL Co, ATTLEBORO, MASS. U.S.A. TRADE MARK B.S.O.' W: 13.0 cm x D: 6.2 cm
How Acquired: Not known
Condition: Good but central split
Location: Archive office. East wall shelves unit 3. Drawer 1

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