Geometric Model, L. Brill No. 150. Ser. 1 No. 2a, Central Surface of a Paraboloid

Geometric Model, L. Brill No. 150. Ser. 1 No. 2a, Central Surface of a Paraboloid

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Description
This white plaster model has a rectangular base and a central peak with four concave sides. It goes with model 1985.0112.117.
The model was designed in 1877 by L. Schleiermacher under the supervision of Ludwig Brill at the technical high school in Munich. It shows the locus of centers of principal curvature of an elliptic paraboloid (that is to say, the envelope or caustic of reflected rays). The mantels are united. A tag on the base of the model reads: 150.
This example of the model was exhibited at the German Educational Exhibit at the Columbian Exposition, a World’s Fair held in Chicago in 1893. It there was purchased by Wesleyan University in Connecticut, and subsequently was donated to the Smithsonian.
References:
Ludwig Brill, Catalog mathematischer Modelle..., Darmstadt: L. Brill, 1892, p. 3, 86.
Accession file.
Location
Currently not on view
Object Name
geometric model
geometric model
date made
1892
maker
L. Brill
place made
Germany: Hesse, Darmstadt
Physical Description
plaster (overall material)
Measurements
overall: 10 cm x 7.6 cm x 6 cm; 3 15/16 in x 3 in x 2 3/8 in
ID Number
1985.0112.118
catalog number
1985.0112.118
accession number
1985.0112
Credit Line
Gift of Wesleyan University
subject
Mathematics
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Medicine and Science: Mathematics
Science & Mathematics
Data Source
National Museum of American History
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