Geometric Model, L. Brill No. 96. Ser. 3, No. 4, Ellipsoid
date: label: date made
content: 1878-1900
name: label: maker
content: Brill, L.
notes: label: Description
content: In the nineteenth and early twentieth century, students studying technical subjects often learned about the representation of surfaces by equations in courses in solid analytic geometry. Schools in Europe, the United States, and Japan sometimes purchased models to illustrate such surfaces. This model is part of series of models of quadric surfaces (surfaces of degree two) designed in 1878 by Rudolf Diesel, then a student at the technical high school in Munich. They were published by the firm of Ludwig Brill in Darmstadt.
label: Description
content: The ellipsoid shown can be represented by the equation: x<sup>2</sup>/a<sup>2</sup> + y<sup>2</sup>/ b<sup>2</sup> + z<sup>2</sup>/c<sup>2</sup> = 1. Sections parallel to any of the axes are ellipses. A grid of perpendicular lines of curvature is shown. A partial tag on the model reads: Ellipsoid.[/] Verlag v. L. Brill 3. Ser., Nr. [. . .]. A mark scratched on the top of the model reads: KILROY (/) SAW (/) This.
label: Description
content: Stand MA.304722.23.07 is marked on the bottom III.4, and is probably for this model.
label: Description
content: Compare 1985.0112.069, two further examples of this model. The model is larger than the ellipsoid with catalog number 1985.0112.068, but the same lines of curvature are shown.
label: Description
content: Stand MA.304722.23.07 may be for this model.
label: Description
content: References:
label: Description
content: Ludwig Brill, <I>Catalog mathematischer Modelle. . .</I>, Darmstadt: L. Brill, 1892, p. 7, 75-76, 91.
label: Description
content: Henry Burchard Fine and Henry Dallas Thompson, <I>Coordinate Geometry</I>, New York: Macmillan Company, 1931, pp. 237-239.
label: Description
content: Gerard Fischer, <I>Mathematical Models</I>, Braunschweig / Wiesbaden: Friedr. Vieweg & Sohn, 1986, vol. I, p. 60, vol. II, pp.25-28.
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
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1990.0571.04
label: catalog number
content: 1990.0571.04
label: accession number
content: 1990.0571
objectType: label: Object Name
content: Geometric Model
label: Other Terms
content: Geometric Model; Ellipsoid
physicalDescription: label: Physical Description
content: plaster (overall material)
label: Physical Description
content: paper (tag material)
label: Measurements
content: overall: 10.2 cm x 20 cm x 15 cm; 4 1/32 in x 7 7/8 in x 5 29/32 in