Norton Commander (motorcycle) Norton Commander (motorcycle) The Commander was a Norton motorcycle with a Wankel rotary engine. The first Norton Wankel motorcycle was the 1987 air-cooled Classic, built as a special edition of just 100 machines. It was followed by the air-cooled Interpol 2 model. The Commander was a liquid-cooled successor to the Interpol 2, liquid cooling being adopted for greater power and reliability. The Commander's final-drive chain was protected by a full enclosure. Some cycle parts (such as front wheel, forks & brakes) were bought-in Yamaha items. Two types of Commander were built. The P52 was a single-seat model equipped for police
Regular tuning and temperament theorems of linear algebra that the rank of the regular tuning and the rank of its comma lattice must sum to . The regular tuning formed by the intervals of 12-tone equal temperament has rank 1. Its comma lattice, generated by the syntonic and ditonic commas, has rank 2. A regular tuning generated by the octave and a tempered perfect fifth whose size in octaves is irrational has rank 2. Its comma lattice, generated by the syntonic comma, has rank 1. The regular tuning formed by the intervals of schismic temperament and that formed by the intervals of Helmholtzian temperament