- An inscription on the cardboard box indicates that this semi-finished KRYPTOK lens was manufactured by the American Optical Company. Kryptok lenses were made by fusing together two glasses of different indexes of refraction. Several optical firms, Meyrowitz among them, was selling Kryptok lenses as early as 1904.
- Ref: John R. Schwinzer, “Method of Making Bifocal Lenses,” U.S. Patent 869,938 (Nov. 5, 1907), assigned to The Meyrowitz Manufacturing Company.
- Henry Bolde, “Trifocal Lens,” U.S. Patent 1,082,491 (Dec. 30, 1913), assigned to The Meyrowitz Manufacturing Company.
- Currently not on view
- Object Name
- Other Terms
- Lens; Medicine
- American Optical Company
- overall: 1/16 in x 29/32 in x 29/32 in;.127 cm x 2.286 cm x 2.286 cm
- ID Number
- catalog number
- accession number
- Credit Line
- Hendrik de Groot
- See more items in
- Medicine and Science: Medicine
- Data Source
- National Museum of American History
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