During the past year further experimental work has increased the applicability of this method of orienting well cores by their magnetic polarity so that definite results now total approximately 60% of all cores tested, the presence or lack of heavy mineral grains being the depending factor. The most important developments have been, first, the elimination of human errors by making the recording apparatus entirely automatic and foolproof; second, the introduction of automatic and combined forward and reverse runs on cores, which enables the operator to distinguish definitely between polarized mineral grains and material with susceptibility only.

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