Effective Diameter Calculator
 Catalogue Number: 4081 Effective Diameter Calculator Category: Equipment Sub-Category: Dispensing tool Corporation: J & S WYLDE, OPTICAL ENGINEERS & LENS MAKERS Time Period: 1940 to 1999 Place Of Publication/Manufacture: Leatherhead, England Publisher/Manufacturer: J. & S. WYLDE LTD Description Of Item: Blue plastic measure with sliding part used to measure the inside diameter of a spectacle frame to ensure the lens blank is large enough to be edged into the frame correctly. 5 concentric rings marked 40, 50, 60, 70 & 80 and a sliding part marked 'Dencentration' with numbers 10,0,10. Overall size 158 x 100mm.'Effective Diameter Calculator' printed at the top. Along bottom is 'J & S WYLDE' above 'OPTICAL ENGINEERS & LENS MAKERS' with 'Kingston Rd, Leatherhead KT22 England. Telephone 03723 77738/9, Cables Optec Leatherhead Telex 895416' to the side. How Acquired: Donated by Elizabeth Hatfield Date Acquired: 13/10/2019 Condition: Good Location: Archive office. East wall shelves unit 3. Drawer 9 |