Abstract
Soon after the publication of Prof. P. M. S. Blackett's paper1, Dr. E. C. Bullard suggested to us that it should be possible to test Blackett's theory against other theories by measurements of the magnetic field of the earth in the mines of the Witwaters-rand. By courtesy of the management of the Blyvooruitzicht G.M. Co., we made a series of underground observations on Blyvooruitzicht mine.
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References
Blackett, P. M. S., Nature, 159, 658 (1947).
Krahmann, R., Trans. Geol. Soc., S. Africa, 39, 1 (1936).
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HALES, A., GOUGH, D. Blackett's Fundamental Theory of the Earth's Magnetic Field. Nature 160, 746 (1947). https://doi.org/10.1038/160746a0
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DOI: https://doi.org/10.1038/160746a0
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