Curves and surfaces of constant width
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.