This white plaster model of a minimal surface is supported by three metal rods above a black wooden stand. A grid of parabolas, as well as a single red line, are indicated. There are no labels.
The model was designed by Hjalmar Tallqvist (1870-1958), a student at the University of Helsinki, under the direction of E. R. Neovius.
This example of the model was exhibited at the Columbian Exposition, a world’s fair held in Chicago in 1893.
References:
L. Brill, Catalog mathematischer Modelle. . ., Darmstadt: L. Brill, 1892, p. 39, 84-85.
Fischer, Gerd, ed., Mathematical Models, vol. 1, Braunschweig / Wiesbaden: Vieweg, 1986, p. 89.
Fischer, Gerd, ed., Mathematical Models, vol. 2, Braunschweig / Wiesbaden: Vieweg, 1986, pp. 39-40.
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