Special Techniques in Magnetic Recording for Motion Picture Production
George Lewin · Journal of the Society of Motion Picture and Television Engineers · 1951
Several modifications in standard magnetic recording systems which provide greatly improved operating efficiency as well as economies in time and materials are described. These include facilities for: (1) stopping and reversing recorder and projector without losing synchronism, and (2) changing over from Record to Playback, or vice versa, silently, while running. These facilities muke it possible to correct errors in narration and re-recording jobs without need for rethreading, splicing or blooping the film. Also described is a new method for domestic and foreign lip-synchronous production which makes use of 35-mm magnetic loops.