Demonstration Eye

Demonstration Eye

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This consists of a hollow ball with a lens at one side and a piece of ground glass at the other. When the lens is held towards an object, an inverted image will be seen on the ground glass. Two other lenses, one concave and the other convex, can be placed in front of the lens in the eye, and the effect of near and far sighted vision can be seen.
Ref: E. M. ClarkeCatalogue of Philosophical Apparatus (London, 1842), p. 38.
Lerebours et Secretan, Catalogue et Prix des Instruments d’Optique, de Physique, de Chimie (Paris, 1853), p. 36.
Currently not on view
Object Name
demonstration eye
overall: 21.5 cm x 8 cm x 9.8 cm; 8 7/16 in x 3 1/8 in x 3 7/8 in
overall: 8 1/2 in x 3 3/8 in x 3 1/8 in; 21.59 cm x 8.5725 cm x 7.9375 cm
ID Number
accession number
catalog number
Credit Line
Bowdoin College
Science & Scientific Instruments
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History
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