Geometric Model, L. Brill. No.171. Ser. 13 No.9, Ruled Surface with One Double Line of Third Degree and Four Real Pinch Points
date: label: date made
content: 1892
name: label: maker
content: L. Brill
notes: label: Description
content: The German Karl Rohn (1855-1920) intended to become an engineer, but found the mathematical part of his studies at the polytechnic in Darmstadt more intriguing. He studied mathematics with Alexander von Brill and Felix Klein in Munich, and went on to a career as a professor of mathematics in Leipzig and Dresden.
label: Description
content: In 1886 and again in 1892, Rohn published sets of string models with the publisher and mathematical model distributor Ludwig Brill. Several models from the first set, Brill’s Series XIII, were exhibited at the Columbian Exposition, a world’s fair held in Chicago in 1893. This is one of them, number 9 in the series. It has a black metal frame and gold strings.
label: Description
content: As described in the Brill catalog, the surface consists of a mantle on which there are two pieces of the double curve; the generators are partly real, partly ideal, double secants of the space curve of third order, including four tangents.
label: Description
content: Compare 1985.0112.128, MA.211257.122 and MA.304722.29. The last two models are by Richard P. Baker.
label: Description
content: References:
label: Description
content: L. Brill, <I>Catalog mathematischer Modelle. . .</I>, Darmstadt: L. Brill,1892, pp. 27-28, 69.
label: Description
content: An example of the model is shown in the website of the Dresden collection of mathematical models, accessed October 17, 2017. At that time, their copy of this model was described at http://www.math.tu-dresden.de/modellsammlung/karte.php?ID=557.
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: 1985.0112.128
label: catalog number
content: 1985.0112.128
label: accession number
content: 1985.0112
objectType: label: Object Name
content: geometric model
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: 18.5 cm x 18 cm x 17.7 cm; 7 9/32 in x 7 3/32 in x 6 31/32 in