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Optical Tables for Contact Lens Work
ARCHIVAL ITEMS
pamphlet
Francis, J. L.; The Hatton Press Ltd
Europe: United Kingdom
1968
paper
overall: 248 mm x 187 mm
2021.233
ARCHIVAL ITEMS
pamphlet
Francis, J. L.; The Hatton Press Ltd
Europe: United Kingdom
1968
paper
overall: 248 mm x 187 mm
Printed pamphlet reproducing six tables to aid contact lens calculations. Portrait format, printed in black and white on 24 pages with soft end papers, stapled. Table 1: Effective power of spectacle lenses in air - positives - negatives; Table 2: Surface power; Table 3: change in reduced vergence due to thickness; Table 4: Liquid lens, surface power table; Table 5: added vergence for thickness; Table 6: Power of Plastic/Liquid Surface for various Radii.
2021.233
Gift of Mr Graeme Holland, 2021