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    A treatise of artificial magnets

    in which is shewn an easy and expeditious method of making them, superior to the best natural ones, and also, a way of improving the natural ones and of changing or converting their poles. Diretions are likewise given for making the mariner's needles in the best form, and for touching them most advantageously, etc
    Michell, John [1724-1793]
    Cambridge : printed by J. Bentham ..., 1750