Geometric Model, L. Brill No. 196. Ser. 16, No. 9, Union of a Confocal Ellipsoid, Hyperboloid of One Sheet, and Hyperboloid of Two Sheets
date: label: date made
content: 1892
name: label: maker
content: L. Brill
notes: label: Description
content: 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 ninth in the series, represents the union of models I, IV and V in the series – that is to say a confocal ellipsoid, hyperboloid of one sheet, and hyperboloid of two sheets. A torn paper tag on the model reads: [. . .] 6. A second torn paper tag reads: [. . .] ids mit [. . .] (/) [. . .] und ein [. . .] (/) [. . .] Hyperbolo [. . .] (/) [. . .] Ser. I. Nr. IX.
label: Description
content: 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.
label: Description
content: Compare 1990.0571.20.
label: Description
content: Reference:
label: Description
content: L. Brill, <I>Catalog mathematischer Modelle. . .</I>, Darmstadt: L. Brill,1892, p. 37, 76.
label: Location
content: Currently not on view
place: label: place made
content: Germany: Hesse, Darmstadt
topic: label: Subject
content: Mathematics
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Science & Mathematics
creditLine: label: Credit Line
content: Gift of Wesleyan University
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1985.0112.152
label: catalog number
content: 1985.0112.152
label: accession number
content: 1985.0112
objectType: label: Object Name
content: Geometric Model
label: Object Name
content: geometric model
physicalDescription: label: Physical Description
content: plaster (overall material)
label: Measurements
content: overall: 21.5 cm x 29.5 cm x 15.5 cm; 8 15/32 in x 11 5/8 in x 6 3/32 in