Plastics in Optics PD Rule and Contact Lens Diameter Gauge

Catalogue Number: 3797
Plastics in Optics PD Rule and Contact Lens Diameter Gauge
Category: Equipment
Sub-Category: PD ruler, pupillometer
Corporation: Barnes-Hind International
Year Of Publication/Manufacture: c 1966
Time Period: 1940 to 1999
Publisher/Manufacturer: Plastics in Optics
Description Of Item: White plastic rule 158 mm x 28 mm x 2 mm with bevelled edges on face printed in black with a centimetre scale with millimetre divisions on the upper edge and an inch scale with sixteenths divisions on lower edge. Central section is imprinted 'Plastics in Optics Subsidiary of Barnes-Hind International' and a Barnes-Hind logo. The reverse is a diameter gauge for rigid corneal contact lenses using a tapered groove to measure diameters from 6 mm to 11.5 mm. A scale is printed in black has 0.1 mm divisions above the groove and the words 'LENS DIA GAGE' are printed below.
Historical Significance: Promotional material produced by a contact lens manufacturer, Barnes-Hind.
How Acquired: Donated by Robert Kaye
Date Acquired: 26/10/2017
Condition: Good
Location: Archive office. East wall shelves unit 3. Drawer 10

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