Abstract
(1) Earlier tests of continuation systems on fields of ideal bodies minimized errors due to finite sizes of the ring systems used for calculation. This happened because the field due to an ideal body or a group of bodies falls to zero at large lateral distances. The object of Nettleton and Cannon’s paper is to correct this situation by conducting tests on “continuous” periodic fields. However, they seem to have largely defeated the purpose by choosing periodic fields which consist of alternations (about a zero value) of positive and negative anomalies of equal magnitude and the same (but inverted) shape. As long as the ring system is not unduly small, the contribution to the upward continuation integral from the area outside the ring system will be nearly zero. This is because the positive and the negative contributions from the plus and minus anomalies in such fields will tend to cancel each other. The fields chosen by Nettleton and Cannon, therefore, are virtually equivalent to what they themselves declared as unsatisfactory.
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