Opthalmometer
name: label: maker
content: F.A. Hardy & Co.
notes: label: Description
content: An ophthalmometer measures the curvature of the anterior surface of the cornea, and so is used to assess the extent and axis of astigmatism. The German physiologist Hermann von Helmholtz introduced the form in the 1850s. This example was designed by an optical expert named Charles H. Pixley (1844-1919) and advertised as a “Hardy Twentieth Century Opthalmometer.” An inscription reads “F. A. HARDY & CO. / MAKERS / CHICAGO.”
label: Description
content: Ref: Charles H. Pixley, “Opthalmometer,” U.S. Patent 1,046,105 (Dec. 3, 1912), assigned to F. A. Hardy & Co.
label: Description
content: Charles H. Pixley, <i>An Optical Primer</i> (Chicago, 1916).
label: Description
content: F. A. Hardy & Co., <i>Catalogue of Opthalmological Instrument and Equipment</i> (Chicago, 1918), p. 31.
place: label: place made
content: United States: Illinois, Chicago
topic: label: associated subject
content: Ophthalmology
setName: label: See more items in
content: Medicine and Science: Medicine
label: See more items in
content: Health & Medicine
creditLine: label: Credit Line
content: Dr. Jacob Staiman
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MG.M-09330
label: catalog number
content: M-09330
label: accession number
content: 223937
objectType: label: Object Name
content: Ophthalmometer
label: Other Terms
content: Ophthalmometer; Opthalmoscope; Opthalmometer; Medicine
physicalDescription: label: Measurements
content: overall: 57 cm x 65 cm x 41 cm; 22 7/16 in x 25 9/16 in x 16 1/8 in