Geometric Model, L. Brill No. 29. Ser. 4 No. 5, Hyperbolic Paraboloid (Adjustable Ruled Sufrace)
date: label: date made
content: 1892
name: label: maker
content: L. Brill
notes: label: Description
content: This adjustable string model with a metal frame shows a ruled surface, that is to say a surface swept out by moving straight lines. 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 model has a metal frame with two triangular metal pieces that can be opened to lie horizontally or raised to approach one another. These pieces are pivoted together at both ends and attached to a metal frame. Red and gold strings join opposite sides of the frame and each is held tight by a bead at one end and a weight at the other. When the triangular pieces lie flat, the strings are all in a plane; as the edges are raised, the surface becomes a doubly ruled hyperbolic paraboloid.
label: Description
content: References:
label: Description
content: Ludwig Brill, <I>Catalog mathematischer Modelle. . .</I>, Darmstadt: L. Brill, 1892, p. 10, 60.
label: Description
content: Gerard Fischer, <I>Mathematical Models</I>, Braunschweig / Wiesbaden: Friedr. Vieweg & Sohn, 1986, vol. I, p. 9, vol. II, pp.3-4.
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: 1985.0112.023
label: catalog number
content: 1985.0112.023
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: 43.5 cm x 47.5 cm x 15.5 cm; 17 1/8 in x 18 11/16 in x 6 3/32 in