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

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb xlink:href="040/01/172.jpg" pagenum="154"/>
              from the piece; and the departing from the ſtate of reſt, cannot
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              be, unleſſe the immobility of the Terreſtrial Globe be
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              ſed, which is the concluſion of that was in diſpute; Therefore,
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              I reply, that thoſe who make the Earth moveable, anſwer, that
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              the piece, and the ball that is in it, partake of the ſame motion
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              with the Earth; nay that they have this together with her from
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              nature; and that therefore the ball departs in no other manner
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              from its quieſcence, but conjoyned with its motion about the
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              tre, the which by its projection upwards, is neither taken away,
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              nor hindered; and in this manner following, the univerſal motion
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              of the Earth towards the Eaſt, it alwayes keepeth perpendicular
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              over the ſaid piece, as well in its riſe as in its return. </s>
              <s>And the
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              ſame you ſee to enſue, in making the experiment in a ſhip with
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              a bullet ſhot upwards perpendicularly with a Croſſe-bow, which
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              returneth to the ſame place whether the ſhip doth move, or ſtand
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                <lb/>
                <arrow.to.target n="marg344"/>
              </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg342"/>
                <emph type="italics"/>
              An inſtance
                <lb/>
              gainst the diurnal
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              motion of the earth,
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              taken from the ſhot
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              of a Peece of
                <lb/>
              nance
                <lb/>
              larly.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg343"/>
                <emph type="italics"/>
              The anſwer to the
                <lb/>
              objection, ſhewing
                <lb/>
              the equivoke.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg344"/>
                <emph type="italics"/>
              Another anſwer
                <lb/>
              to the ſame
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              on.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="main">
              <s>SAGR. </s>
              <s>This ſatisfieth very well to all; but becauſe that I have
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              ſeen that
                <emph type="italics"/>
              Simplicius
                <emph.end type="italics"/>
              taketh pleaſure with certain ſubtilties to
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              puzzle his companions, I will demand of him whether,
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              ſing for this time that the Earth ſtandeth ſtill, and the piece
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              cted upon it perpendicularly, directed to our Zenith, he do at all
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              queſtion that to be the true perpendicular ſhot, and that the ball
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              in departing, and in its return is to go by the ſame right line,
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              ſtill ſuppoſing all external and accidental impediments to be
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              moved?</s>
            </p>
            <p type="main">
              <s>SIMP. </s>
              <s>I underſtand that the matter ought to ſucceed exactly
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              in that manner.</s>
            </p>
            <p type="main">
              <s>SAGR. </s>
              <s>But if the piece were placed, not perpendicularly, but
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              inclining towards ſome place, what would the motion of the ball
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              be? </s>
              <s>Would it go haply, as in the other ſhot, by the
                <lb/>
              cular line, and return again by the ſame?</s>
            </p>
            <p type="main">
              <s>SIMP. </s>
              <s>It would not ſo do; but iſſuing out of the piece, it
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              would purſue its motion by a right line which prolongeth the
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              rect perpendicularity of the concave cylinder of the piece, unleſſe
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              ſo far as its own weight would make it decline from that erection
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              towards the Earth.</s>
            </p>
            <p type="main">
              <s>SAGR. </s>
              <s>So that the mounture of the cylinder is the regulator of
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              the motion of the ball, nor doth it, or would it move out of that
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              line, if its own gravity did not make it decline downwards. </s>
              <s>And </s>
            </p>
            <p type="main">
              <s>
                <arrow.to.target n="marg345"/>
                <lb/>
              therefore placing the cylinder perpendicularly, and ſhooting the
                <lb/>
              ball upwards, it returneth by the ſame right line downwards;
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              cauſe the motion of the ball dependent on its gravity is
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              ward, by the ſame perpendicular. </s>
              <s>The journey therefore of the
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              ball out of the piece, continueth or prolongeth the rectitude or
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              perpendicularity of that ſmall part of the ſaid journey, which it
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              made within the ſaid piece; is it not ſo?</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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