In a previous paper it has been shown that a general method may be developed for calculating the various changes which take place in a flowing gas. The changes considered were the addition and extraction of heat in a subsonic flow, the addition and extraction of heat in a supersonic flow and sudden changes, such as shock waves. The changes were considered to be stationary and to take place in a parallel pipe. It was of interest to see if a similar approach would produce a general treatment for moving waves. The investigation was limited to moving shock waves and detonation waves.