Geometric Model, L. Brill No. 152. Ser. 1 No. 3a, Central Surface

Geometric Model, L. Brill No. 152. Ser. 1 No. 3a, Central Surface

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This white plaster model has a rectangular base and then is oval, crimping toward the center and then expanding again into an oval, flat top. Four curves are indicated. It goes with 1985.0112.121.
The model was designed in 1877 by Walter Dyck under the supervision of Ludwig Brill at the technical high school in Munich. It shows the locus of centers of principal curvature of a one-sheeted hyperboloid (that is to say, the envelope or caustic of reflected rays). A tag on the base of the model reads: 152.
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.
L. Brill, Catalog mathematischer Modelle..., Darmstadt: L. Brill, 1892, p. 3, 86.
Accession file.
Currently not on view
Object Name
geometric model
geometric model
date made
L. Brill
place made
Germany: Hesse, Darmstadt
Physical Description
plaster (overall material)
overall: 17 cm x 16.5 cm x 14 cm; 6 11/16 in x 6 1/2 in x 5 1/2 in
ID Number
catalog number
accession number
Credit Line
Gift of Wesleyan University
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Medicine and Science: Mathematics
Science & Mathematics
Data Source
National Museum of American History
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