| 摘要 |
An instrument for discriminating peripheral thicknesses of lenses comprises a plurality of plates 3a to 3i each having a different thickness and supporting members 1 and 2, by means of which, before finishing of the edge of a lens, the thickness that the periphery of the lens will have after processing can be first determined from data tables provided on the members 1, 2 and can then be actually felt and seen on the plates 3a to 3i. <IMAGE> |
