'Helical' spring folding eyeglasses with oval lenses
- maker:
- John Braham
'Helical' spring folding eyeglasses with oval lenses, made by John Braham, Bristol, 1828-1838 to Braham's patent No. 389, in 1861.
Details
- Category:
- Optics
- Object Number:
- 1921-323/279
- Materials:
- metal, steel, plastic (unidentified) and glass
- Measurements:
-
overall: 32 mm x 110 mm x 4 mm, , .01kg
- credit:
- Dunscombe collection of spectacles