Geometric Model, L. Brill No. 28. Ser. 4 No. 4, Hyperbolic Paraboloid (Ruled Surface)
date: label: date made
content: 1892
name: label: maker
content: L. Brill
notes: label: Description
content: This fixed string model shows a ruled surface, that is to say a surface swept out by a moving straight line. The model was published by the firm of Ludwig Brill in Darmstadt beginning in 1879. This example was exhibited at the German Educational Exhibit at the Columbian Exposition held in Chicago in 1893, where it was purchased by Wesleyan University.
label: Description
content: The surface is the saddle-shaped hyperbolic paraboloid, shown in red strings and bounded by a black metal frame. The frame has two straight edges along opposite bottom sides, joined by curved edges to form a four-sided base. Above the two opposite straight base edges are edges in the shape of a parabolas. The parabolas are joined at the top by a cross bar. A row of holes extends along each curved edge at the base and along each parabola.
label: Description
content: References:
label: Description
content: Ludwig Brill, <I>Catalog mathematischer Modelle. . .</I>, Darmstadt: L. Brill, 1892, p. 9, 59-60.
label: Description
content: Henry Burchard Fine and Henry Dallas Thompson, <I>Coordinate Geometry</I>, New York: Macmillan Company, 1931, pp. 243-244. An example of this model is shown in Figure 7.
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: 1985.0112.022
label: catalog number
content: 1985.0112.022
label: accession number
content: 1985.0112
objectType: label: Object Name
content: geometric model
physicalDescription: label: Physical Description
content: string (overall material)
label: Physical Description
content: metal (overall material)
label: Measurements
content: overall: 22.5 cm x 17.5 cm x 30 cm; 8 27/32 in x 6 7/8 in x 11 13/16 in