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)

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Two Franklin Split Bifocal' lenses: (1) Oval, consisting of two half lenses of foci, 40' and 41' respectively; (2)
Science Museum Group
© The Board of Trustees of the Science Museum

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
type:
lenses
taxonomy:
  • components
  • components
credit:
United Kingdom Optical Co.