Abstract
The purpose of a magnetic chart is to represent graphically the distribution of one or several magnetic elements over a portion of the Earth's surface or over the entire surface of the globe. The variation of the element with altitude is rarely charted.If the net of magnetic stations were sufficiently dense that an interpolation between the observed values of the element in question for points where no observations have been made, would involve no appreciable error, the magnetic chart could be considered as representing the true or real distribution of the element. Such an interpolation is justified only if we are sure that the survey has disclosed all places of extreme values—maxima and minima—of the element. But this applies only to very detailed microsurveys for which the mean distance between the extremes of magnetic elements is of the order one km1. Accordingly the great majority of magnetic charts represent the smoothed2 or normal distribution of the magnetic elements3.
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