Curves and surfaces of constant width

#constant width#lambda-convexity#Schilling#movable

Date of design: 1913 Designer: Prof. Dr. Fr. Schilling in Danzig Title in the catalog: (de) 16 Modelle von Kurven konstanter Breite Size: 12x12 cm Price in the catalog: 145 marks (for models No. 4-19 and measuring apparatus), 9 marks each (1913)

A curve of constant width is a curve such that the distance between any two parallel tangent (supporting) lines is constant.Trivial example is a circle; one of the most famous is a Reuleaux triangle.

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