Heavy flint 64 a new glass type for spectacle production
 Catalogue Number: 2082 Heavy flint 64 a new glass type for spectacle production Category: Memorabilia and ephemera Sub-Category: Advertising, trade and products Author: KRATZER B and GOTTLOB H Year Of Publication/Manufacture: 1974 Time Period: 1940 to 1999 Place Of Publication/Manufacture: Oberkocken, Germany Publisher/Manufacturer: Carl Zeiss Description Of Item: Booklet, 7 pages plus 11 pages of illustrations, booklet opens to show pages of text to the left and the illustrations to the right. The material was presented as a lecture at the WVAO congress in Baden-Baden 1975. Also filed with this booklet is a A4 promotional card for ASL Spectralite high index Semi-finished lenses SOLA OPTICAL 1995 Historical Significance: The text claims that heavy flint or SF 64 is a new type of glass with special properties. It discusses how those properties effect thickness, weight, appearance and optical properties. It also discusses how the material should be processed. How Acquired: Donated by Elizabeth Hatfield, member of the College Date Acquired: August 2012 Condition: Mint Location: Archive office. Pamphlet and ephemera filing cabinet. Drawer 5 |