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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 fifth in the series, represents a hyperbola of two sheets. It has the same foci as the ellipsoid that first model in the series and the hyperbola of one sheets that is the fourth model (for it, see 1985.0112.148).
A paper tag on the model reads: 192. Another tag reads: Zweischaliges Hyperboloid. (/) Verl. v. L. Brill. 16. Ser. I. Nr. V.
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.
L. Brill, Catalog mathematischer Modelle..., Darmstadt: L. Brill,1892, p. 37, 59.
Currently not on view
Germany: Hesse, Darmstadt
plaster (overall material)
metal (overall material)
overall: 21.5 cm x 19.3 cm x 14 cm; 8 15/32 in x 7 19/32 in x 5 1/2 in
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