Geometric Model, L. Brill No. 149. Ser. 1 No. 2a, Central Surface of a Paraboloid
date: label: date made
content: 1892
name: label: maker
content: L. Brill
notes: label: Description
content: This white plaster model has a rectangular base. The surface rising from the base begins as an ellipse and rises to a central peak. No curves are drawn on it.
label: Description
content: This model was designed in 1877 by L. Schleiermacher under the supervision of Ludwig Brill at the technical high school in Munich and published as part of the first series issued by Brill. It shows the locus of centers of principal curvature of an elliptic paraboloid (that is to say, the envelope or caustic of reflected rays). The mantels are separated. A tag on the base of the model reads: 149. Another tag reads: Centralfläche des Paraboloids. (/) Verl. v. L. Brill. 1. Ser. Nr. IIa.
label: Description
content: See also 1985.0112.0118
label: Description
content: This example of the model was exhibited at the German Educational Exhibit at the Columbian Exposition, a World’s Fair held in Chicago in 1893. It there was purchased by Wesleyan University in Connecticut, and subsequently was donated to the Smithsonian.
label: Description
content: References:
label: Description
content: Ludwig Brill, <I>Catalog mathematischer Modelle. . .</I>, Darmstadt: L. Brill, 1892, p. 3, 86.
label: Description
content: Accession file.
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: 1985.0112.117
label: catalog number
content: 1985.0112.117
label: accession number
content: 1985.0112
objectType: label: Object Name
content: geometric model
label: Object Name
content: geometric model
physicalDescription: label: Physical Description
content: plaster (overall material)
label: Measurements
content: overall: 9 cm x 10 cm x 8.5 cm; 3 17/32 in x 3 15/16 in x 3 11/32 in