Hin's Rigid Contact Lens Diameter Rule
 Catalogue Number: 3435 Hin's Rigid Contact Lens Diameter Rule Category: Equipment Sub-Category: Contact lens equipment Corporation: Hin's Contact Lens Labs (Pty) Ltd Year Of Publication/Manufacture: c 1960 Time Period: 1940 to 1999 Place Of Publication/Manufacture: Johannesburg, South Africa Publisher/Manufacturer: Hin's Contact Lens Labs (Pty) Ltd Description Of Item: White Plastic Rule 170 x 30 mm engraved in black with Hin's Contact Lens Labs (Pty) Ltd P.O. Box 10888 J.H.B. 2000 Tel-23-0216 along the top edge and the numbers 8.0 to 12.0 in 0.5 steps and line graduations above each number along the bottom edge. There are four shorter graduations between each of the numbers. The top edge of the scale is along a tapered recess into which a rigid contact lens can be slid to determine its diameter. Historical Significance: Rules of this type allowed reasonably accurate measurement of the diameter of rigid contact lenses. How Acquired: Donated by Robert Kaye Date Acquired: 26/10/2017 Condition: Good Location: Archive room. West wall. Unit 6 Drawer 2 |