The component of total magnetic intensity in the direction of the earth's total field, the quantity measured by the airborne magnetometer, is studied in relation to point-pole and line-of-poles sources. Theoretical profiles are examined for maxima and minima, and it is established that the depth is a linear function of the half-maximum abscissa. A family of curves is presented by means of which factors can be obtained for use in estimating depths. The well-known factors used with vertical intensity profiles are included as a special case. An example is given in which the factors are used in analyzing a theoretical anomaly.
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Henderson et al. (1948) studied this question.