White oval Bright's patent bi-focal spectacle lens with triangular segment

Made:
1912
White oval Bright's patent bi-focal spectacle lens with

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White oval Bright's patent bi-focal spectacle lens with
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© The Board of Trustees of the Science Museum

White oval Bright's patent bi-focal spectacle lens with triangular segment, AD 1912.

Details

Category:
Optics
Object Number:
1921-323/53
Measurements:
overall: 41 x 32 mm
type:
ophthalmic lens
credit:
Dunscombe collection of spectacles