Cycloid Cycloid A cycloid is the curve traced by a point on the rim of a circular wheel as the wheel rolls along a straight line without slipping. A cycloid is a specific form of trochoid and is an example of a roulette, a curve generated by a curve rolling on another curve. The cycloid, with the cusps pointing upward, is the curve of fastest descent under constant gravity, and is also the form of a curve for which the period of an object in descent on the curve does not depend on the object's starting position. The cycloid has been
Rolling stock of the South Manchuria Railway number, which followed the type indicator letter. This class designator was then followed by the road number, counted starting at 1. As in Period 2, the American-style wheel arrangement was used as the basis for the classification system introduced in 1920. However, in the new system, the American name was used as the basis for the class name, using two syllables of the American name as the new class name. The class name was made up of three katakana, of which the first two indicated the wheel arrangement, and the third indicated the class number – i.e. first, second, third,