Bi-focal spectacle lens
- Made:
- 1899
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