Geometric Model, L. Brill No. 151. Ser. 1 No. 2b, Central Surface
date: label: date made
content: 1892
name: label: maker
content: L. Brill
notes: label: Description
content: This white plaster model of a central surface has a rectangular base and a central peak. There are no curves indicated. It represents the union of models 149 and 150 (1985.112.117 and 1985.112.118). The model was designed in 1877 by L. Schleiermacher under the supervision of Ludwig Brill at the technical high school in Munich. It shows the locus of centers of principal curvature of an elliptic paraboloid (that is to say, the envelope or caustic of reflected rays). A tag on the base of the model reads: 151. Another tag reads: Centralfläche des Paraboloids. (/) Verl. v. L. Brill. 1. Ser. Nr. IIb.
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: L. 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: 1985.0112.119
label: catalog number
content: 1985.0112.119
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: 11 cm x 10 cm x 9 cm; 4 11/32 in x 3 15/16 in x 3 17/32 in