"Franz Reuleaux (French: [ʁœlo]; German: [ʁøˈloː]; 30 September 1829 – 20 August 1905), was a German mechanical engineer and a lecturer of the Berlin Royal Technical Academy, later appointed as the President of the Academy. He was often called the father of kinematics. He was a leader in his profession, contributing to many important domains of science and knowledge.
Today, he may be best remembered for the Reuleaux triangle, a curve of constant width that he helped develop as a useful mechanical form." - (en.wikipedia.org 04.12.2020)
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