Optical Tonometer
name: label: maker
content: American Optical Company
notes: label: Description
content: An optical tonometer determines intraocular pressure by measuring the resistance of a cornea to indentation. The basic form was invented by a German professor in 1862. The “GRADLE SCHIOTZ TONOMETER” inscription on the case of this example refers to Harry Sears Gradle (1883-1950), a Chicago ophthalmologist and professor; and Hjalmar August Schiőtz, a Norwegian ophthalmologist who presented his design to the Norwegian Medical Society in 1905. That inside the case reads “AMERICAN OPTICAL COMPANY / SOUTHBRIDGE, MASS.”
label: Description
content: Ref: V. Mueller & Co., <i>Surgeon’s Instruments, Office and Hospital Equipment</i> (1916), p. 3.
label: Description
content: “Dr. Harry Gradle, An Eye Surgeon, 66,” <i>New York Times</i> (May 27, 1950), p. 11.
label: Location
content: Currently not on view
place: label: place made
content: United States: Massachusetts, Southbridge
setName: label: See more items in
content: Medicine and Science: Medicine
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 2012.0165.932
label: catalog number
content: 2012.0165.932
label: accession number
content: 2012.0165
objectType: label: Object Name
content: tonometer
physicalDescription: label: Measurements
content: case: 1 1/4 in x 6 1/16 in x 3 in; 3.175 cm x 15.39875 cm x 7.62 cm
label: Measurements
content: tonometer: 3/4 in x 4 3/4 in x 1 3/4 in; 1.905 cm x 12.065 cm x 4.445 cm