The magnetic properties of oriented rock samples from some Tertiary igneous intrusions in the Isle of Mull have been investigated. Analysis of the directions of natural residual magnetization, supported by some subsidiary experiments, shows that most of the natural magnetization could have been acquired by cooling in an ambient magnetic field. The analysis reveals two main directions of magnetization, one approximately in the direction of the present terrestrial field and the other in opposition to it. Various possible causes of the reversed magnetization are discussed and a suggestion is put forward that it may have been produced by reversals of the terrestrial field in the past.
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S. A. Vincenz (1954) studied this question.
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