Lens
name: label: maker
content: American Optical Company
notes: label: Description
content: An inscription on this lens reads “KRYPTOK / NO. 45 / KRYPTOK SALES CO.” That on the cardboard box indicates that the 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.
label: Description
content: Ref: John R. Schwinzer, “Method of Making Bifocal Lenses,” U.S. Patent 869,938 (Nov. 5, 1907), assigned to The Meyrowitz Manufacturing Company.
label: Description
content: Henry Bolde, “Trifocal Lens,” U.S. Patent 1,082,491 (Dec. 30, 1913), assigned to The Meyrowitz Manufacturing Company.
label: Location
content: Currently not on view
setName: label: See more items in
content: Medicine and Science: Medicine
creditLine: label: Credit Line
content: Hendrik de Groot
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MG.M-04931
label: catalog number
content: M-04931
label: accession number
content: 158527
objectType: label: Object Name
content: Lens
label: Other Terms
content: Lens; Medicine
physicalDescription: label: Measurements
content: overall: 1/4 in x 29/32 in x 29/32 in; .635 cm x 2.286 cm x 2.286 cm