Demonstration Eye with Two Lenses

Demonstration Eye with Two Lenses

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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.
Gerhardt, a major instrument house in Bonn that began trading as such in 1872, termed this an “Optische Augen-Modell.”
Ref: C. Gerhardt, Preis-Verzeichnis über Physikalische Apparate, Instrumente und Gerätschaften (Bonn, 1893), p. 75.
Currently not on view
Object Name
demonstration eye
date made
late nineteenth century
C. Gerhardt
place made
Germany: North Rhine-Westphalia, Bonn
Physical Description
paper (overall material)
wood (overall material)
overall: 19 cm x 10.5 cm x 14 cm; 7 1/2 in x 4 1/8 in x 5 1/2 in
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
ID Number
catalog number
accession number
Credit Line
Colgate College
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History
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