Two "Franklin Split Bifocal" lenses: (1) Oval, con

Two "Franklin Split Bifocal" lenses: (1) Oval, consisting of two half lenses of foci, 40" and 41" respectively; (2) Round, consisting of two half lenses of foci 40" and 9" respetively

Details

Category:
Optics
Object Number:
1933-148
credit:
United Kingdom Optical Co.
status:
Permanent collection

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