Demonstration Eye with Two Lenses
date: label: date made
content: late nineteenth century
name: label: maker
content: C. Gerhardt
notes: label: Description
content: This is a papier maché model of an eye on a turned wooden stand. There is a lens at one side of the eye, and a brass sighting tube at the other. Two other lenses, one concave and the other convex, can be placed in front of the lens in the eye, so that the effect of near and far sighted vision can be seen.
label: Description
content: Gerhardt, a major instrument house in Bonn that began trading as such in 1872, termed this an “Optische Augen-Modell.”
label: Description
content: Ref: C. Gerhardt, <i>Preis-Verzeichnis über Physikalische Apparate, Instrumente und Gerätschaften</i> (Bonn, 1893), p. 75.
label: Location
content: Currently not on view
place: label: place made
content: Germany: North Rhine-Westphalia, Bonn
topic: label: Subject
content: Science
setName: label: See more items in
content: Medicine and Science: Physical Sciences
creditLine: label: Credit Line
content: Colgate University
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.318741
label: catalog number
content: 318741
label: accession number
content: 234695
objectType: label: Object Name
content: demonstration eye
physicalDescription: label: Physical Description
content: paper (overall material)
label: Physical Description
content: wood (overall material)
label: Measurements
content: overall: 19 cm x 10.5 cm x 14 cm; 7 1/2 in x 4 1/8 in x 5 1/2 in
label: Measurements
content: overall: 7 1/2 in x 4 1/16 in x 5 1/2 in; 19.05 cm x 10.31875 cm x 13.97 cm