Bi-focal spectacle lens

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

Made:: 1899

Oval white 'Kryptok' cemented bi-focal spectacle lens with

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Oval white 'Kryptok' cemented bi-focal spectacle lens with
Science Museum Group
© The Board of Trustees of the Science Museum

Oval white 'Kryptok' cemented bi-focal spectacle lens with protecting plate and ground edges, Patent No. 10773, AD 1899.

Details

Category:: Optics

Object Number:: 1921-323/50

Measurements:: overall: 42 x 33 mm

type:: ophthalmic lens

credit:: Dunscombe collection of spectacles

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