Geometric Model, L. Brill or M. Schilling, Surface of Rotation

Geometric Model, L. Brill or M. Schilling, Surface of Rotation

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Description
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.
References:
L. Brill, Catalog, 1892, p. 12, 78. Here the model is designated as #104 in series 5, model XVIIIa.
M. Schilling, Catalog, 1911. P. 12, 141. Here the model is #215 in series 5, 7a
Location
Currently not on view
Object Name
Geometric Model
date made
1880-1914
place made
Germany
Physical Description
plaster (overall material)
Measurements
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
ID Number
1990.0571.06
catalog number
1990.0571.06
accession number
1990.0571
subject
Mathematics
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Data Source
National Museum of American History
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