Round white 'Kryptok' tonc bi-focal spectacle lens

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

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Round white 'Kryptok' tonc bi-focal spectacle lens
Science Museum Group
© The Board of Trustees of the Science Museum

Round white 'Kryptok' tonc bi-focal spectacle lens, ground and polished on segment side.

Details

Category:: Optics

Object Number:: 1921-323/61

Measurements:: overall: 46 mm

type:: ophthalmic lens

credit:: Dunscombe collection of spectacles

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