Geometric Model, L. Brill No. 158 Ser. 6. No. 3, Wave Surface of a Positive Uniaxial Crystal, D41,8

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Description
The German label on this white plaster model indicates that it is a model of a wave surface for a positive uniaxial optical crystal, L. Brill Ser. 10.1 No. 7. Such a model always has an outer shell that is a sphere and an inner shell that is an ellipsoid. However, this model is an ellipsoid with one octant cut away to reveal part of a sphere. Thus this is a model of a wave surface of a negative uniaxial crystal whose Brill model is No. 158, Ser. 6, No. 3. The correct label for this model appears on 1982.0795.21.
This is one of a series of models designed at the Munich polytechnic high school under the direction of Alexander Brill in 1880.
Compare to 1985.0112.124.
References:
L. Brill, Catalog, 1892, p. 13, 87.
For examples of related models, with a reference to a related publication, see the Goettingen collection of mathematical models, model numbers 283 (Schilling #356) and 284 (Schilling #357).
Francis A. Jenkins and Harvey E. White, Fundamentals of Optics, New York: McGraw Hill, 1976, p. 553-555.
Location
Currently not on view
date made
1880-1901
maker
L. Brill
place made
Deutschland
Physical Description
plaster (overall material)
Measurements
overall: 8 cm x 9 cm x 9 cm; 3 5/32 in x 3 17/32 in x 3 17/32 in
ID Number
1982.0795.23
catalog number
1982.0795.23
accession number
1982.0795
Credit Line
Gift of the Department of Mathematics, The University of Michigan
subject
Mathematics
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Data Source
National Museum of American History

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