Geometric Model, L. Brill No. 206. Ser. 17 No. 3b, Surface of Constant Positive Curvature, Sievert's Surface
date: label: date made
content: 1892
name: label: maker
content: L. Brill
notes: label: Description
content: This plaster model consists of four roughly spherical parts attached to one another. It represents a surface of constant positive curvature. More specifically, it is a surface of Enneper of elliptic type. The Enneper surface is a minimal surface (a surface of zero mean curvature) that intersects itself.
label: Description
content: A paper tag on the model reads: 206. Another tag reads: Fläche von const. posit. Krűmm.-Mass [/] mit einem System ebener Krűmm.-Lin. [/] II. Cycl. Typus [/] Verl. v. L. Brill. 17. Ser. Nr. 3b.
label: Description
content: The model was designed for Ludwig Brill by Georg H. L. Sievert in 1886. A student of Alexander Brill in Munich, Sievert spent much of his career teaching mathematics in Nuremberg and Bayreuth.
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. 41, 81.
label: Description
content: Accession file.
label: Description
content: http://www.math.rug.nl/models/ - This website displays an example of the model sold somewhat later by Brill’s successor, Martin Schilling. Schilling sold this model as Ser. 17, No. 3.
label: Description
content: G. Fischer, <I>Mathematical Models</I>,vol. I, p. 83 (Photo #87), vol. 2, pp. 38-39.
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
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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: 1985.0112.158
label: catalog number
content: 1985.0112.158
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: 8.5 cm x 14.5 cm x 17.5 cm; 3 11/32 in x 5 23/32 in x 6 7/8 in