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The suggestion offered by Father Kircher, in his Magnes sive de arte magnetica, is a little different from the preceding. The celebrated Jesuit father seeks however, to do nothing more than to effect a communication of thoughts between two rooms in the same building.
Later writers have, it is true, always admitted the honour on behalf of the Republic, and Pontano goes so far as to call Amalfi magnetica in compliment thereof, whilst during the later crusades the Amalfitani, who were evidently convinced of the genuine nature of Gioja’s claim, had an heraldic figure of the mariner’s compass emblazoned on their banners.
Van Helmont adopted these views in his famous treatise "De Magnetica Vulnerum Curatione," in which he asserted that cures were wrought through magnetic influence.
Galileo, in Dialogo intorno, written between 1621 and 1632 and Nicolas Caboeus, of Ferrara, in his Philosophia magnetica, both reproduce analogous descriptions, not however without raising doubts as to the possibility of such a system.
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