Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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ſed to make its vibrations ſucceſſively more and more frequent;
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and conſequently is able to bring a continual impediment to the
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plummet C; and for a proof that this is ſo, if we do but obſerve
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the thread A C, we ſhall ſee it diſtended not directly, but in an
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arch; and if inſtead of the thread we take a chain, we ſhall
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cern the effect more perſectly; and eſpecially removing the
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vity C, to a conſiderable diſtance from the perpendicular A B, for
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that the chain being compoſed of many looſe particles, and each of
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them of ſome weight, the arches A E C, and A F D, will appear
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notably incurvated. </
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<
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>By reaſon therefore, that the parts of the
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chain, according as they are neerer to the point A, deſire to make
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their vibrations more frequent, they permit not the lower parts of
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the ſaid chain to ſwing ſo far as naturally they would: and by
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continual detracting from the vibrations of the plummet C, they
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finally make it ceaſe to move, although the impediment of the air
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might be removed.</
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The vibrations
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of the ſame
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dulum
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are made
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with the ſame
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quency, whether
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they be ſmall or
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great.
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The cauſe which
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impedeth the
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dulum,
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and
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ceth it to reſt.
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The thread or
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chain to which a
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pendulum
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is
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ned, maketh an
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arch, and doth not
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ſtretch it ſelfe
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ſtreight out in its
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vibrations.
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<
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>SAGR. </
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>The books are now come; here take them
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Simplicius,
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and find the place you are in doubt of.</
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<
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>SIMP. See, here it is where he beginneth to argue againſt the
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diurnal motion of the Earth, he having firſt confuted the annual.
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Motus terræ annuus aſſerrere
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Copernicanos
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cogit converſionem
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juſdem quotidianam; alias idem terræ Hemiſphærium continenter
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ad Solem eſſet converſum obumbrato ſemper averſo. [In Engliſh
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thus:]
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The annual motion of the Earth doth compell the
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pernicans
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to aſſert the daily converſion thereof; otherwiſe the
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ſame Hemiſphere of the Earth would be continually turned
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wards the Sun, the ſhady ſide being always averſe. </
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>And ſo one
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half of the Earth would never come to ſee the Sun.</
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>SALV. </
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>I find at the very ſirſt ſight, that this man hath not rightly
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apprehended the
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Copernican Hypotheſis,
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for if he had but taken
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notice how he alwayes makes the Axis of the terreſtrial Globe
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perpetually parallel to it ſelf, he would not have ſaid, that one
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half of the Earth would never ſee the Sun, but that the year
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would be one entire natural day, that is, that thorow all parts of
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the Earth there would be ſix moneths day, and ſix moneths night,
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as it now befalleth to the inhabitants under the Pole, but let
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this miſtake be forgiven him, and let us come to what
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neth.</
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>SIMP. </
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>It followeth,
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Hanc autem gyrationem Terræ
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poſſibilem eſſe ſic demonſtramus.
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Which ſpeaks in Engliſh thus:
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That this gyration of the Earth is impoſſible we thus demonſtrate.
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<
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>That which enſueth is the declaration of the following figure,
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wherein is delineated many deſcending grave bodies, and
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ing light bodies, and birds that fly too and again in the air, &c.</
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<
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>SAGR. </
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<
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>Let us ſee them, I pray you. </
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<
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>Oh! what fine figures, </
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