Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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Globe is Load-ſtone; but onely to ſhew that no reaſon could be
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given why one ſhould be more unwilling to grant that it is of
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Load-ſtone, than of ſome other matter. </
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<
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ſeriouſly conſider, you ſhall find that it is not improbable, that
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one ſole, pure, and arbitrary name, hath moved men to think
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that it conſiſts of Earth; and that is their having made uſe
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monly from the beginning of this word Earth, as well to
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ſie that matter which is plowed and ſowed, as to name this our
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Globe. </
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>The denomination of which if it had been taken from
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ſtone, as that it might as well have been taken from that as
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from the Earth; the ſaying that its primary ſubſtance was ſtone,
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would doubtleſſe have found no ſcruple or oppoſition in any
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man. </
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>And is ſo much the more probable, in that I verily
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lieve, that if one could but pare off the ſcurf of this great Globe,
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taking away but one full thouſand or two thouſand yards; and
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afterwards ſeperate the Stones from the Earth, the
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on of the ſtones would be very much biger than that of the
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tile Mould. </
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>But as for the reaſons which concludently prove
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de
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facto,
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that is our Globe is a Magnet, I have mentioned none of
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them, nor is this a time to alledg them, and the rather, for that
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to your benefit you may read them in
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Gilbert
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; onely to
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rage you to the peruſal of them, I will ſet before you, in a
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litude of my own, the method that he obſerved in his
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phy. </
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>I know you underſtand very well how much the
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ledg of the accidents is ſubſervient to the inveſtigation of the
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ſubſtance and eſſence of things; therefore I deſire that you
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would take pains to informe your ſelf well of many accidents and
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properties that are found in the Magnet, and in no other ſtone,
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or body; as for inſtance of attracting Iron, of conferring
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on it by its ſole preſence the ſame virtue, of communicating
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likewiſe to it the property of looking towards the Poles, as it
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alſo doth it ſelf; and moreover endeavour to know by trial,
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that it containeth in it a virtue of conferring upon the magnetick
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needle not onely the direction under a Meridian towards the
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Poles, with an Horizontal motion, (a property a long time ago
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known) but a new found accident, of declining (being ballanced
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under the Meridian before marked upon a little ſpherical
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net) of declining I ſay to determinate marks more or leſſe,
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cording as that needle is held nearer or farther from the Pole,
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till that upon the Pole it ſelf it erecteth perpendicularly,
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as in the middle parts it is parallel to the Axis. </
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<
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>Furthermore
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cure a proof to be made, whether the virtue of attracting Iron,
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reſiding much more vigorouſly about the Poles, than about the
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middle parts, this force be not notably more vigorous in one
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Pole than in the other, and that in all pieces of Magnet; the </
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