Geometric Model, L. Brill No. 196 Ser. 16 No. 9, Confocal Ellipsoid, Hyperboloid of One Sheet, and Hyperboloid of Two Sheets
date: label: date made
content: 1888-1901
name: label: maker
content: Brill, L.
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: Vereinungung eines Ellipsoides mit ei [. . .] (/) confokalen einschaligen und einen (/) confokalen zweischaligen Hyperbolo [. . .] (/) Verl. v. L. Brill. 16. Ser. I. Nr. [. . .].
label: Description
content: Compare 1985.0112.152.
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
topic: label: Subject
content: Mathematics
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Science & Mathematics
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1990.0571.20
label: catalog number
content: 1990.0571.20
label: accession number
content: 1990.0571
objectType: label: Object Name
content: Geometric Model
physicalDescription: label: Physical Description
content: plaster (overall material)
label: Measurements
content: overall: 21.8 cm x 29 cm x 15.2 cm; 8 19/32 in x 11 13/32 in x 5 31/32 in