The "Null method" of azimuth alignment in multitrack magnetic tape recording

A number of methods for azimuth alignment were investigated. A technique for alignment which compares the output from two tracks of a multitrack tape provided a substantial improvement in alignment accuracy as compared to the methods which had been in use up to this time. A method for adjusting the lateral position of the head across the width of the tape was also developed which made use of the same basic principles as the "null method" of azimuth alignment.