Object Details
- 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 fourth in the series, represents a hyperbola of one sheet. It has the same foci as the ellipsoid that first model in the series and the hyperbola of two sheets that is the fifth model (for it, see 1985.0112.149).
- A mark on the top of the model reads: Sarmusbsi (/) "45".
- Compare 1985.0112.148.
- Reference:
- L. Brill, Catalog mathematischer Modelle. . ., Darmstadt: L. Brill,1892, p. 35, 58.
- Location
- Currently not on view
- Data Source
- National Museum of American History
- date made
- 1888-1914
- Physical Description
- plaster (overall material)
- Measurements
- overall: 21 cm x 24 cm x 11 cm; 8 9/32 in x 9 7/16 in x 4 11/32 in
- Object Name
- Geometric Model
