Links to online books and articles relating to the American Revolution 1775-1783 generally and to the Southern Campaign specifically. Search metadata Search full text of books Search TV captions Search archived web sites Advanced Search. Editor-in-Chief Daniel Zwillinger Rensselaer Polytechnic Institute Troy, New York Associate Editors Steven G. Hahnel Powerstation Tc Compact Manual Treadmills. Krantz Washington University St. Louis, Missouri.

Water valve cover in shaped like a Reuleaux triangle. A Reuleaux triangle is a shape formed from the intersection of three, each having its center on the boundary of the other two. Its boundary is a, the simplest and best known such curve other than the circle itself. Constant width means that the separation of every two parallel is the same, independent of their orientation.

Because all its diameters are the same, the Reuleaux triangle is one answer to the question 'Other than a circle, what shape can a be made so that it cannot fall down through the hole?' Reuleaux triangles have also been called spherical triangles, but that term more properly refers to triangles on the curved surface of a. They are named after, a 19th-century German engineer who pioneered the study of machines for translating one type of motion into another, and who used Reuleaux triangles in his designs. However, these shapes were known before his time, for instance by the designers of church windows, by, who used it for a, and by in his study of constant-width shapes.