Model No. 233 FA: 40
Description: Areas and curves of constant width and constant perimeter; in addition straps to push through
RE: M3 319,325,339,347 Jessen: Über konvexe Punktmengen konstanter Breite. Math. Zeitschrift B 29 Heft 2/3 Category: Other exhbits
RU: E VI 13-25