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 |