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This white plaster model shows the inner shell of a Fresnel wave surface for a biaxial crystal. A paper tag on the model reads: D41,10.
The outer shell of the wave surface is 1982.0795.25 and is L. Brill’s model No. 160, 1a.
A wooden stand with museum number MA.304722.23.4 may be for this model.
This is a white plaster model of the outer shell of a Fresnel wave surface for a biaxial crystal. The model originally was in two pieces that were notched to fit together. Both of the original two pieces are broken in half.
A paper tag on one piece reads: D41,10. Another paper tag reads: Fresnel'sche Wellenflache (/) Verl. v. L. Brill 6. Ser. Nr. 1a.
The inner shell of the wave surface is 1982.0795.24.
The model is part of a series designed under the direction of Alexander Brill at the technical high school in Munich and first published in Darmstadt in 1880.
L. Brill, Catalog, 1892, p. 13, 87.
For examples of related models, with a reference to a related publication, see the Goettingen collection of mathematical models, model numbers 285 and 286.
Currently not on view
Geometric Model; Wave Surface
Germany: Hesse, Darmstadt
plaster (overall material)
overall: 6.4 cm x 8 cm x 5.8 cm; 2 17/32 in x 3 5/32 in x 2 9/32 in
Gift of the Department of Mathematics, The University of Michigan