Trial Case (Bifocal Segments)
 Catalogue Number: 2908 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 & a hook clasp. Dark blue velvet lining to lid. Contains 12 pairs of cement bifocal lenses, Adds +0.75 to +3.50. (0.75 lens pair missing)Each 37 mm rim (nickel alloy) holds a flat plano glass lens onto which is cemented a 15 mm bifocal segment. Dimensions: W:13.8cm x D:10.5cm x H:5.2cm. How Acquired: Donated by Estate of William Cooper, via Peter Lewis Date Acquired: April 2016 Condition: Lenses: very good, Case:good except pin of hook clasp missing as are two lenses Location: Archive office. East wall shelves unit 2 |