Geometric Model, L. Brill No. 193. Ser. 16 No. 6, Union of an Ellipsoid with a Confocal Hyperboloid of One Sheet

Geometric Model, L. Brill No. 193. Ser. 16 No. 6, Union of an Ellipsoid with a Confocal Hyperboloid of One Sheet

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Description
In 1888, Ludwig Brill of Darmstadt published a series of nine models for teaching about surfaces of the second degree that have the same foci (confocal surfaces). The plaster models were patterned after some designed by the Finnish mathematician Edvard Rudolf Neovius (1851-1917) of Helsinki. This, the sixth in the series, represents the union of an ellipsoid with a confocal hyperboloid of one sheet. It has the same foci as the ellipsoid that is the first model in the series and the hyperbola of one sheet that is the fourth model (1985.0112.148). A torn paper tag on the model reads: Vereinigung ein [...] (/) confokalen eins [...] (/) Verl. v. L. Brill [...].
This example of the model was exhibited at the Columbian Exposition, a world’s fair held in Chicago in 1893, where it was purchased by Wesleyan University.
Reference:
L. Brill, Catalog mathematischer Modelle..., Darmstadt: L. Brill,1892, p. 37, 76.
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: 21 cm x 25 cm x 13 cm; 8 9/32 in x 9 27/32 in x 5 1/8 in
ID Number
1985.0112.150
catalog number
1985.0112.150
accession number
1985.0112
Credit Line
Gift of Wesleyan University
subject
Mathematics
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Data Source
National Museum of American History
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