Bi-focal spectacle lens

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