Oval white 'Kryptok' fused bi-focal spectacle lens with ground edges

Made:
1904
Oval white 'Kryptok' fused bi-focal spectacle lens with ground

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

Oval white 'Kryptok' fused bi-focal spectacle lens with ground edges, separation impossible, Patent No. 18158, AD 1904.

Details

Category:
Optics
Object Number:
1921-323/51
Measurements:
overall: 45 x 36 mm
type:
ophthalmic lens
credit:
Dunscombe collection of spectacles