Abstract
DR. CHAPMAN'S important letter (NATURE, November 25, 1920) bases a theory of cosmical magnetism on the presence of gyroscopic magnetic elements proved to exist in ferro-magnetic substances by my investigations on magnetisation by rotation. But he considers my fundamental theory to require serious modification. As I understand his letter, however, his theory is identical with mine (see Science, Vol. xlviii., p. 304, 1918, and references) except as to paramagnetic and diamagnetic bodies. He has, I think, confused my treatments of magnetic intensity and intensity of magnetisation.
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BARNETT, S. Molecular and Cosmical Magnetism. Nature 107, 8–9 (1921). https://doi.org/10.1038/107008b0
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DOI: https://doi.org/10.1038/107008b0
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