Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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ſtronger of which Poles is that which looketh towards the South.
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<
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>Obſerve, in the next place, that in a little Magnet this South and
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more vigorous Pole, becometh weaker, when ever it is to take
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up an iron in preſence of the North Pole, of another much
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ger Magnet: and not to make any tedious diſcourſe of it,
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tain your ſelf, by experience, of theſe and many other properties
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deſcribed by
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Gilbert,
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which are all ſo peculiar to the Magnet, as
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that none of them agree with any other matter. </
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<
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>Tell me now,
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Simplicius,
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if there were laid before you a thouſand pieces of
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ſeveral matters, but all covered and concealed in a cloth, under
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which it is hid, and you were required, without uncovering them,
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to make a gueſſe, by external ſignes, at the matter of each of
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them, and that in making trial, you ſhould hit upon one that
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ſhould openly ſhew it ſelf to have all the properties by you
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dy acknowledged to reſide onely in the Magnet, and in no other
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matter, what judgment would you make of the eſſence of ſuch a
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body? </
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>Would you ſay, that it might be a piece of Ebony, or
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Alablaſter, or Tin.</
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Our Globe would
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have been called
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ſtone, in ſtead of
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Earth, if that
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name had been
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uen it in the
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ginning.
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The method of
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Gilbert
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in his
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loſophy.
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Many
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ties in the
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net.
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An Argument
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proving the
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ſtrial Globe to be
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a
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Magnet.</
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>SIMP. </
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>I would ſay, without the leaſt hæſitation, that it was a
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piece of Load-ſtone.</
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>SALV. </
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<
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>If it be ſo, ſay reſolutely, that under this cover and
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ſcurf of Earth, ſtones, metals, water, &c. </
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<
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>there is hid a great
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Magnet, foraſmuch as about the ſame there may be ſeen by any
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one that will heedfully obſerve the ſame, all thoſe very accidents
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that agree with a true and viſible Globe of Magnet; but if no
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more were to be ſeen than that of the Declinatory Needle, which
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being carried about the Earth, more and more inclineth, as it
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proacheth to the North Pole, and declineth leſſe towards the
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quinoctial, under which it finally is brought to an
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Æquilibrium,
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it might ſerve to perſwade even the moſt ſcrupulous judgment. </
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>I
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forbear to mention that other admirable effect, which is ſenſibly
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obſerved in every piece of Magnet, of which, to us inhabitants
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of the Northern Hemiſphere, the Meridional Pole of the ſaid
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net is more vigorous than the other; and the difference is found
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greater, by how much one recedeth from the Equinoctial; and
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under the Equinoctial both the parts are of equal ſtrength, but
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notably weaker. </
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<
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>But, in the Meridional Regions, far diſtant
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from the Equinoctial, it changeth nature, and that part which to
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us was more weak, acquireth more ſtrength than the other: and
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all this I confer with that which we ſee to be done by a ſmall
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piece of Magnet, in the preſence of a great one, the vertue of
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which ſuperating the leſſer, maketh it to become obedient to it,
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and according as it is held, either on this or on that ſide the
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noctial of the great one, maketh the ſelf ſame mutations,
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which I have ſaid are made by every Magnet, carried on this </
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