Selected segment of calculated high density

PART OF:: Display board of spectacles and lenses, c.1921

Selected segment of calculated high density, ground flat on one face and curved on the other. Stage in the manufacture of 'Kryptok' bi-focal spectacle lenses.

Details

Category:: Optics

Object Number:: 1921-323/56

Measurements:: overall: 28 mm

type:: ophthalmic lens

credit:: Dunscombe collection of spectacles

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