Trial Case (Bifocal Segments)
 Catalogue Number: 1994 Trial Case (Bifocal Segments) Category: Equipment Sub-Category: Trial lens case Year Of Publication/Manufacture: c1910 Time Period: 1900 to 1939 Description Of Item: Small wooden trial case covered in black leatherette with hinged lid & hook clasp. Brown velvet lining to lid. Contains 12 pairs of cement bifocal lenses, Adds +0.75 to +3.50. Each 37mm rim (nickel alloy) holds a flat plano glass lens onto which is cemented a 15mm bifocal segment. Dimensions: W:13.8cm x D:10.5cm x H:5.2cm. How Acquired: Not known Condition: Lenses: very good, Case:fair Location: Archive office. East wall shelves unit 2 |