Slab and segment fused by heat
Slab and segment fused by great heat and carefully annealed. Stage in the manufacture of 'Kryptok' bi-focal spectacle lenses.
Details
- Category:
- Optics
- Object Number:
- 1921-323/58
- Measurements:
-
overall: 45 mm
- type:
- ophthalmic lens
- credit:
- Dunscombe collection of spectacles
