This hollow white plaster model of a third order surface has three symmetrically arranged high points around a central opening. Some pieces are missing. This model, along with all the models of Series 7, is on the design of Carl Rodenberg of the technical high school in Munich.. It was first published by Brill in 1881. A paper tag at the base reads: 34. Another tag reads: Fl. 3. Ord. mit 4 reellen con. Knpktn. [/] Verl. v. L. Brill. 7 Ser. Nr. 5.
The object was exhibited at the German Educational Exhibit at the Columbian Exposition, a World’s Fair held in Chicago in 1893. It there was purchased by Wesleyan University in Connecticut, and subsequently was donated to the Smithsonian.
References:
L. Brill, Catalog mathematischer Modelle. . ., Darmstadt: L. Brill,1892, p.14, 61.
Accession file.
G. Fischer, Mathematical Models, Braunschweig: Vieweg, 1986, vol. 1, p. 17, vol. 2, pp. 12-14.
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