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

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