Geometric Model, L. Brill or M. Schilling, Surface of Rotation
date: label: date made
content: 1880-1914
notes: label: Description
content: In 1880, Ludwig Brill published two plaster models of geodetic lines on surfaces of revolution that had been designed by A. von Braunmühl (1853-1908), a student and later teacher of mathematics in Munich who would become a well-known historian of mathematics. This is an example of one of them. It shows the surface generated when an ellipse is rotated about its minor axis. An envelope of lines is indicated, including a circular equator and an ellipse perpendicular to the equator. This example of the model has no tags, but the intersection of the equator and the ellipse is marked: A. The intersection of the ellipse, a curve parallel to the equator, and a third curve is marked: A1.
label: Description
content: References:
label: Description
content: L. Brill, <I>Catalog</I>, 1892, p. 12, 78. Here the model is designated as #104 in series 5, model XVIIIa.
label: Description
content: M. Schilling, <I>Catalog</I>, 1911. P. 12, 141. Here the model is #215 in series 5, 7a
label: Location
content: Currently not on view
place: label: place made
content: Germany
topic: label: Subject
content: Mathematics
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Science & Mathematics
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1990.0571.06
label: catalog number
content: 1990.0571.06
label: accession number
content: 1990.0571
objectType: label: Object Name
content: Geometric Model
physicalDescription: label: Physical Description
content: plaster (overall material)
label: Measurements
content: overall: 7 cm x 9.5 cm x 9.5 cm; 2 3/4 in x 3 3/4 in x 3 3/4 in