Abstract
MR. WATSON asks, What is the physical evidence in favour of the existence of A, B, C, and α, β, γ? With regard to the former the evidence, derived from the permanence of the magnetisation in a small piece of a hard steel magnet, seems to me almost conclusive; while the following consideration tells very strongly in favour of α, β, γ.
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MCCONNEL, J. Magnetic Theory. Nature 35, 344–345 (1887). https://doi.org/10.1038/035344d0
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DOI: https://doi.org/10.1038/035344d0
