Geometric Model, L. Brill No. 231, Ser. 21 No. 1, Ruled Surface, Space Curve of Fourth Order

Geometric Model, L. Brill No. 231, Ser. 21 No. 1, Ruled Surface, Space Curve of Fourth Order

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This is one of a set of seven models of surfaces representing space curves of fourth order designed by Karl Rohn, professor of mathematics at the technical high school in Dresden. The series was first published by Brill in 1892. The black metal frame of this string model has two opposite sides that are circles, with two loops in each circle. The other two sides are H-shaped. The top and bottom contain a quadrilateral with curved sides. There are red and green strings, some with beads on them, many broken.
This example of the model was exhibited at the Columbian Exposition, a World’s Fair held in Chicago in 1893.
Compare models 1985.0112.181, 1985.0112.182, 1985.0112.183, 1985.0112.184, and 1985.0112.186.
L. Brill, Catalog mathematischer Modelle..., Darmstadt: L. Brill, 1892, pp. 40-42, 75.
An example of this model, with tag, is in the collections of the University of Utrecht, giving it the Brill series 21, number 1 designation. See
Currently not on view
Object Name
geometric model
geometric model
date made
L. Brill
place made
Germany: Hesse, Darmstadt
Physical Description
string (overall material)
glass (overall material)
metal (overall material)
overall: 21.6 cm x 20.7 cm x 18.6 cm; 8 1/2 in x 8 5/32 in x 7 5/16 in
ID Number
catalog number
accession number
Credit Line
Gift of Wesleyan University
See more items in
Medicine and Science: Mathematics
Data Source
National Museum of American History
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