Ophthalmometer
name: label: maker
content: Pfister und Streit
notes: label: Description
content: An ophthalmometer (aka keratometer) 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. The donor acquired this example in Germany around 1906. The inscription reads "Pfister und Streit in Bern, No. 280, No 29715 DRP.”
label: Description
content: F. Hermann and H. Studer began making scientific instruments in Bern, Switzerland, in 1858. When J. H. Pfister replaced Studer, the firm became Hermann & Pfister (1866-1881). Alfred Streit joined in 1889, and the firm was trading as Pfister und Streit by 1906. William Haag (Streit’s son-in-law) took control after World War I and renamed the firm Haag-Streit. The firm is still in business today.
label: Location
content: Currently not on view
place: label: place made
content: Switzerland: Bern
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: Arthur O. Morton
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MG.M-06574
label: catalog number
content: M-06574
label: accession number
content: 191792
label: serial number
content: 29715
objectType: label: Object Name
content: Ophthalmometer
label: Object Name
content: Keratometer
label: Object Name
content: ophthalmometer
label: Other Terms
content: Ophthalmometer; Medicine
physicalDescription: label: Measurements
content: overall: 11 in x 24 in x 20 in; 27.94 cm x 60.96 cm x 50.8 cm
label: Measurements
content: overall: 32 in x 15 in x 20 in; 81.28 cm x 38.1 cm x 50.8 cm