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

List of thumbnails

< >
161
161
162
162
163
163
164
164
165
165
166
166
167
167
168
168
169
169
170
170
< >
page |< < of 701 > >|
    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb xlink:href="040/01/180.jpg" pagenum="162"/>
              in thoſe very great ones which ſundry accidents continually
                <lb/>
                <arrow.to.target n="marg355"/>
                <lb/>
              duce. </s>
              <s>And all this hath been ſpoken and granted on good grounds
                <lb/>
              to
                <emph type="italics"/>
              Simplicius,
                <emph.end type="italics"/>
              and only with an intent to advertiſe him how much
                <lb/>
              it importeth to be cautious in granting many experiments for true
                <lb/>
              to thoſe who never had tried them, but only eagerly alledged them
                <lb/>
              juſt as they ought to be for the ſerving their purpoſe: This is
                <lb/>
              ken, I ſay, by way of ſurpluſſage and Corollary to
                <emph type="italics"/>
              Simplicius,
                <emph.end type="italics"/>
              for
                <lb/>
                <arrow.to.target n="marg356"/>
                <lb/>
              the real truth is, that as concerning theſe ſhots, the ſame ought
                <lb/>
              actly to befall aſwell in the motion as in the reſt of the Terreſtrial
                <lb/>
              Globe; as likewiſe it will happen in all the other experiments
                <lb/>
              that either have been or can be produced, which have at firſt bluſh
                <lb/>
              ſo mnch ſemblance of truth, as the antiquated opinion of the
                <lb/>
              Earths motion hath of equivocation.</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg355"/>
                <emph type="italics"/>
              It is requiſite to
                <lb/>
              be very cautious in
                <lb/>
              admitting
                <lb/>
              ments for true, to
                <lb/>
              thoſe who never
                <lb/>
              tried them.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg356"/>
                <emph type="italics"/>
              Experiments and
                <lb/>
              arguments againſt
                <lb/>
              the Earths motion
                <lb/>
              ſeem ſo far
                <lb/>
              cluding, as they lie
                <lb/>
              hid under
                <lb/>
              vokes.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="main">
              <s>SAGR. </s>
              <s>As for my part I am fully ſatisfied, and very well
                <lb/>
              derſtand that who ſo ſhall imprint in his fancy this general
                <lb/>
              munity of the diurnal converſion amongſt all things Terreſtrial,
                <lb/>
              to all which it naturally agreeth, aſwell as in the old conceit of its
                <lb/>
              reſt about the centre, ſhall doubtleſſe diſcern the fallacy and
                <lb/>
              voke which made the arguments produced ſeem eoncluding.
                <lb/>
              </s>
              <s>There yet remains in me ſome hæſitancy (as I have hinted
                <lb/>
              fore) touching the flight of birds; the which having as it were an
                <lb/>
              animate faculty of moving at their pleaſure with a thouſand
                <lb/>
              tions, and to ſtay long in the Air ſeparated from the Earth, and
                <lb/>
              therein with moſt irregular windings to go fluttering to and again,
                <lb/>
              I cannot conceive how amongſt ſo great a confuſion of motions,
                <lb/>
              they ſhould be able to retain the firſt commune motion; and in
                <lb/>
              what manner, having once made any ſtay behind, they can get
                <lb/>
              it up again, and overtake the ſame with flying, and kcep pace
                <lb/>
              with the Towers and trees which hurry with ſo precipitant a courſe
                <lb/>
              towards the Eaſt; I ſay ſo precipitant, for in the great circle of
                <lb/>
              the Globe it is little leſſe than a thouſand miles an hour, whereof
                <lb/>
              the flight of the ſwallow I believe makes not fifty.</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>If the birds were to keep pace with the courſe of the
                <lb/>
              trees by help of their wings, they would oſ neceſſity flie very faſt;
                <lb/>
              and if they were deprived of the univerſal converſion, they would
                <lb/>
              lag as far behind; and their flight would ſeem as furious towards
                <lb/>
              the Weſt, and to him that could diſcern the ſame, it would
                <lb/>
              much exceed the flight of an arrow; but I think we could not be
                <lb/>
              able to perceive it, no more than we ſee a Canon bullet, whil'ſt
                <lb/>
              driven by the fury of the fire, it flieth through the Air: But the
                <lb/>
              truth is that the proper motion of birds, I mean of their flight,
                <lb/>
              hath nothing to do with the univerſal motion, to which it is
                <lb/>
              ther an help, nor an hinderance; and that which maintaineth
                <lb/>
              the ſaid motion unaltered in the birds, is the Air it ſelf, thorough
                <lb/>
              which they flie, which naturally following the
                <emph type="italics"/>
              Vertigo
                <emph.end type="italics"/>
              of the </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>