Slab ground flat and shaped

Slab ground flat and shaped, with a reading curve depressed on one face. Ready for fusing stage in the manufacture of 'Kryptok' bi-focal spectacle lenses.

Details

Category:
Optics
Object Number:
1921-323/55
Measurements:
overall: 50 mm
type:
ophthalmic lens
credit:
Dunscombe collection of spectacles