Space caustics of quadrics
#principal curvature#one-sheeted hyperboloid#center of curvature#envelope#evolute#caustic#Dyck#Brill
Date of design: 1877Designer: W. Dyck under supervision of Prof. Dr. L. Brill in TU MünchenTitle in the catalog: (de) Die Centrafläche des einschaligen Hyperboloids. a) Die beiden Mäntel der Flache getrennt; b) Die beiden Mäntel vereinigt.Size: a) 17x16 and 17x16 cm; b) 17x16 cm.Price in the catalog: 9.50, 10.50, 12 marks, resp. (1911)
A model of the locus of centers of principal curvatures (the envelope or caustic of reflected rays) of a one-sheeted hyperboloid. The locus had two components corresponding to a minimal, resp., maximal principal curvature.
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