When a long recording gap is used in magnetic-tape recording, recording-response characteristics are sometimes obtained which exhibit a series of maxima and minima, with the frequencies of the maxima and minima being closely related to the gap length. In this study the conditions under which this type of characteristic is obtained are described, and various explanations of the phenomena offered in the past are considered. Additional, new experimental data are presented which show that the undulations in the recording characteristic are due to reinforcement and cancellation of the induction recorded on the tape due to the passage of the tape through two distinct recording regions, one at the leading edge and one at the trailing edge of the gap. It is further shown that both perpendicular and longitudinal components of the recording field play a significant part in the production of the phenomena.
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