Geometric Model, L. Brill No. 124. Ser. 10.2 No. 30m, Surface of Revolution

Geometric Model, L. Brill No. 124. Ser. 10.2 No. 30m, Surface of Revolution

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As a student of Alexander Brill in Munich, Georg H. L. Sievert designed this plaster model of a surface of revolution. Sievert would spend much of his career teaching mathematics in Nuremberg and Bayreuth. The model would be published by Ludwig Brill of Darmstadt in 1885 as the last of the models in his Series 10, 30 (lettered 30a through 30m and given Brill numbers 113 to 124). This is letter “30m” in that series. When Martin Schilling took over Brill’s business, he changed the numbers to Series 10 # 10a through Series 10 #10m (196 through 207). This would be “10m” in that scheme, with model number 207.
This example of the model was exhibited at the German Educational Exhibit at the Columbian Exposition held in Chicago, where it was purchased by Wesleyan University.
The plaster model shows the surface of revolution of the sinusoidal curve z = cos r. Various asymptotic curves are indicated. A paper tag on the model, torn on the right side, reads: Rotat.-Fl. m. Asympt.-(Hpttgt.-) Curven. (/) Verl. v. L. Brill. 10 Ser. 2. Nachtr. Nr. XX [...]
Ludwig Brill, Catalog mathematischer Modelle..., Darmstadt: L. Brill, 1892, p. 22,78-79.
M. Schilling, Catalog mathematischer Modelle..., Halle: M. Schilling, 1903, p. 22, 187.
J. C. Poggendorff, J.C. Poggendorffs biographisch-literarisches Handwörterbuch zur Geschichte der exacten Wissenschaften..., vol. 4, Barth, 1904, p. 1396-1397.
Currently not on view
Object Name
Geometric Model
geometric model
date made
L. Brill
place made
Germany: Hesse, Darmstadt
Physical Description
plaster (overall material)
overall: 5 cm x 21 cm x 21 cm; 1 31/32 in x 8 9/32 in x 8 9/32 in
ID Number
catalog number
accession number
Credit Line
Gift of Wesleyan University
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Medicine and Science: Mathematics
Science & Mathematics
Data Source
National Museum of American History
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