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

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb xlink:href="040/01/178.jpg" pagenum="160"/>
              with that which hath been ſaid already, namely, that in caſe the
                <lb/>
              Earth ſhould move, the ſhots made Eaſtward would prove too
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              high, &c. </s>
              <s>the ball, as it is probable, being to move along the
                <lb/>
              gent.</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>But if I ſhould ſay, that ſo it falleth out upon triall,
                <lb/>
              how would you cenſure me?</s>
            </p>
            <p type="main">
              <s>SIMP. </s>
              <s>It is neceſſary to proceed to experiments for the
                <lb/>
              ving of it.</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>But do you think, that there is to be found a Gunner ſo
                <lb/>
              skilful, as to hit the mark at every ſhoot, in a diſtance of
                <emph type="italics"/>
              v.g.
                <emph.end type="italics"/>
              five
                <lb/>
              hundred paces?</s>
            </p>
            <p type="main">
              <s>SIMP. </s>
              <s>No Sir; nay I believe that there is no one, how good a
                <lb/>
              marks-man ſoever that would promiſe to come within a pace of
                <lb/>
              the mark,</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>How can we then, with ſhots ſo uncertain, aſſure our
                <lb/>
              ſelves of that which is in diſpute?</s>
            </p>
            <p type="main">
              <s>SIMP. </s>
              <s>We may be aſſured thereof two wayes; one, by
                <lb/>
              king many ſhots; the other, becauſe in reſpect of the great
                <lb/>
              city of the Earths motion, the deviation from the mark would in
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              my opinion be very great.</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>Very great, that is more than one pace; in regard that
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              the varying ſo much, yea and more, is granted to happen ordinarily
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              even in the Earths mobility.</s>
            </p>
            <p type="main">
              <s>SIMP. </s>
              <s>I verily believe the variation from the mark would be
                <lb/>
              more than
                <lb/>
                <arrow.to.target n="marg351"/>
              </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg351"/>
                <emph type="italics"/>
              A Computation
                <lb/>
              how much the
                <lb/>
              ges of great ſhot
                <lb/>
              ought to vary from
                <lb/>
              the marke, the
                <lb/>
              Earths motion
                <lb/>
              ing granted.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>Now I deſire that for our ſatisfaction we do make thus
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              in groſſe a ſlight calculation, if you conſent thereto, which will
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              ſtand us in ſtead likewiſe (if the computation ſucceed as I expect)
                <lb/>
              for a warning how we do in other occurrences ſuffer our ſelves, as
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              the ſaying is, to be taken with the enemies ſhouts, and ſurrender
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              up our belief to what ever firſt preſents it ſelf to our fancy. </s>
              <s>And
                <lb/>
              now to give all advantages to the
                <emph type="italics"/>
              Peripateticks
                <emph.end type="italics"/>
              and
                <emph type="italics"/>
              Tychonicks,
                <emph.end type="italics"/>
                <lb/>
              let us ſuppoſe our ſelves to be under the Equinoctial, there to ſhoot
                <lb/>
              a piece of Ordinance point blank Eaſtwards at a mark five
                <lb/>
              dred paces off. </s>
              <s>Firſt, let us ſee thus (as I ſaid) in a level, what
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              time the ſhot after it is gone out of the Piece taketh to arrive at
                <lb/>
              the mark; which we know to be very little, and is certainly no
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              more than that wherein a travailer walketh two ſteps, which alſo
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              is leſs than the ſecond of a minute of an hour; for ſuppoſing
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              that the travailer walketh three miles in an hour, which are nine
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              thouſand paces, being that an hour containes three thouſand, ſix
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              hundred ſecond minutes, the travailer walketh two ſteps and an
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              half in a ſecond, a ſecond therefore is more than the time of the
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              balls motion. </s>
              <s>And for that the diurnal revolution is twenty four
                <lb/>
              hours, the Weſtern horizon riſeth fifteen degrees in an hour, that </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>