Bi-focal spectacles after Benjamin Franklin's design

Made:
1800-1820 in unknown place
Bi-focal spectacles after Franklin's design

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Bi-focal spectacles after Franklin's design
Science Museum Group
© The Board of Trustees of the Science Museum

Bi-focal spectacles after Franklin's design. The lower lens segment is for reading, the upper segment is for distance work. Early 19th century.

Details

Category:
Optics
Object Number:
1921-323/183
Materials:
metal, steel and glass
Measurements:
overall: 40 mm x 145 mm x 30 mm, , .01kg
type:
spectacles
credit:
Dunscombe collection of spectacles