Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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reaſon for the introducing of it: If by pluoking away a piece
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of Loadſtone from the whole natural maſſd, it were deprived of
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the faculty of following it, as it did, whilſt it was unitedy thereto,
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ſo that it is thereby deprived of the revodution about the
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ſal centre of the Terreſtrial Globe, it might Chaply, with
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what greater probability be thought by ſome, that the ſaid
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net was to appropriate to it ſelf a new converſion about its
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cular centre; but if it do no leſſe, when ſeparated, than when
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conjoyned, continue always to purſue its firſt, eternal, and
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ral courſe, to what purpoſe ſhould we go about to obtrude upon
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it another new one?</
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An
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ble effect admired
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by
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Gilbertus
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in the
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Loadſtone.
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>SAGR. </
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>I underſtand you very well, and this puts me in mind
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of a Diſcourſe very like to this for the vanity of it, falling from
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certain Writers upon the Sphere, and I think, if I well
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ber, amongſt others from
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Sacroboſco,
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who, to ſhew how the
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lement of Water, doth, together with the Earth, make a
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pleat Spherical Figure, and ſo between them both compoſe this
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our Globe, writeth, that the ſeeing the ſmall ^{*} particles of water
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ſhape themſelves into rotundity, as in the drops, and in the dew
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daily apparent upon the leaves of ſeveral herbs, is a ſtrong
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gument; and becauſe, according to the trite Axiome, there is
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the ſame reaſon for the whole, as for the parts, the parts affecting
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that ſame figure, it is neceſſary that the ſame is proper to the
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whole Element: and truth is, methinks it is a great overſight
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that theſe men ſhould not perceive ſo apparent a vanity, and
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ſider that if their argument had run right, it would have
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ed, that not only the ſmall drops, but that any whatſoever greater
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quantity of water ſeparated from the whole Element, ſhould be
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duced into a Globe: Which is not ſeen to happen; though indeed
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the Senſes may ſee, and the Underſtanding perceive that the
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lement of Water loving to form it ſelf into a Spherical Figure
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about the common centre of gravity, to which all grave
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dies tend (that is, the centre of the Terreſtrial Globe) it
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therein is followed by all its parts, according to the Axiome;
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ſo that all the ſurfaces of Seas, Lakes, Pools, and in a word,
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of all the parts of Waters conteined in veſſels, diſtend
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themſelves into a Spherical Figure, but that Figure is an arch
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of that Sphere that hath for its centre the centre of the
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reſtrial Globe, and do not make particular Spheres of
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ſelves.</
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The vain
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mentation of ſome
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to prove the
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ment of Water to
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be of a Spherical
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ſuper ficies.
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<
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>SALV. </
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<
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>The errour indeed is childiſh; and if it had
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been onely the ſingle miſtake of
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Sacroboſco,
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I would eaſily
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have allowed him in it; but to pardon it alſo to his
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mentators, and to other famous men, and even to
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Ptolomy
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