Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667

List of thumbnails

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            <p type="main">
              <s>
                <pb xlink:href="040/01/225.jpg" pagenum="207"/>
              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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                <arrow.to.target n="marg412"/>
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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. </s>
              <s>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.</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg410"/>
                <emph type="italics"/>
              The vibrations
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              of the ſame
                <emph.end type="italics"/>
                <lb/>
              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.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg411"/>
                <emph type="italics"/>
              The cauſe which
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              impedeth the
                <emph.end type="italics"/>
                <lb/>
              dulum,
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              and
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              ceth it to reſt.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg412"/>
                <emph type="italics"/>
              The thread or
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              chain to which a
                <emph.end type="italics"/>
                <lb/>
              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.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="main">
              <s>SAGR. </s>
              <s>The books are now come; here take them
                <emph type="italics"/>
              Simplicius,
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              and find the place you are in doubt of.</s>
            </p>
            <p type="main">
              <s>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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                <emph type="italics"/>
              Motus terræ annuus aſſerrere
                <emph.end type="italics"/>
              Copernicanos
                <emph type="italics"/>
              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:]
                <emph.end type="italics"/>
              The annual motion of the Earth doth compell the
                <emph type="italics"/>
                <lb/>
              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. </s>
              <s>And ſo one
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              half of the Earth would never come to ſee the Sun.</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>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.</s>
            </p>
            <p type="main">
              <s>SIMP. </s>
              <s>It followeth,
                <emph type="italics"/>
              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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              </s>
              <s>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.</s>
            </p>
            <p type="main">
              <s>SAGR. </s>
              <s>Let us ſee them, I pray you. </s>
              <s>Oh! what fine figures, </s>
            </p>
          </chap>
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