'Kryptok' tonic bi-focal complete spectacle lens

Oval white 'Kryptok' tonic bi-focal complete spectacle lens

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

Oval white 'Kryptok' tonic bi-focal complete spectacle lens with a ground edge.

Details

Category:
Optics
Object Number:
1921-323/62
Measurements:
overall: 45 x 42 mm
type:
ophthalmic lens
credit:
Dunscombe collection of spectacles