Abstract
IN regard to the quantity P, depending on the distribution of magnetism in a pair of magnets employed for measuring terrestrial horizontal force, for the calculation of which Prof. Harkness, in NATURE for August 18, p. 366, gives a simplified expression, may I be allowed to mention that a yet more simple modification of the ordinary formula has been used in the Greenwich observations since the year 1878, in which, the difference between A and A1 being small,
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ELLIS, W. On the Constant P in Observations of Terrestrial Magnetism. Nature 36, 436 (1887). https://doi.org/10.1038/036436b0
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DOI: https://doi.org/10.1038/036436b0
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