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

Table of figures

< >
[Figure 221]
[Figure 222]
[Figure 223]
[Figure 224]
[Figure 225]
[Figure 226]
[Figure 227]
[Figure 228]
[Figure 229]
[Figure 230]
[Figure 231]
[Figure 232]
[Figure 233]
[Figure 234]
[Figure 235]
[Figure 236]
[Figure 237]
[Figure 238]
[Figure 239]
[Figure 240]
[Figure 241]
[Figure 242]
[Figure 243]
[Figure 244]
[Figure 245]
[Figure 246]
[Figure 247]
[Figure 248]
[Figure 249]
[Figure 250]
< >
page |< < of 701 > >|
    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb xlink:href="040/01/228.jpg" pagenum="210"/>
              not move, and ſo he ſhall not be bound to ſhew how that in
                <lb/>
              cending it continueth all the way vertically over one point, for
                <lb/>
              that it will not do any ſuch thing.</s>
            </p>
            <p type="main">
              <s>SIMP. </s>
              <s>Very well; But if grave bodies, and light can have no
                <lb/>
              principle, either internal or external of moving circularly, than
                <lb/>
              neither can the terreſtrial Globe move with a circular motion: and
                <lb/>
              thus you have the intent of the Author.</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>I did not ſay, that the Earth had no principle, either
                <lb/>
              interne, or externe to the motion of gyration, but I ſay, that I do
                <lb/>
              not know which of the two it hath; and yet my not knowing it
                <lb/>
              hath not a power to deprive it of the ſame; but if this Author
                <lb/>
              can tell by what principle other mundane bodies are moved round,
                <lb/>
              of whoſe motion there is no doubt; I ſay, that that which
                <lb/>
              keth the Earth to move, is a vertue, like to that, by which
                <emph type="italics"/>
              Mars
                <emph.end type="italics"/>
                <lb/>
              and
                <emph type="italics"/>
              Jupiter
                <emph.end type="italics"/>
              are moved, and wherewith he believes that the ſtarry
                <lb/>
              Sphere it ſelf alſo doth move; and if he will but aſſure me, who is
                <lb/>
              the mover of one of theſe moveables, I will undertake to be able
                <lb/>
              to tell him who maketh the Earth to move. </s>
              <s>Nay more; I will
                <lb/>
              undertake to do the ſame, if he can but tell me, who moveth the
                <lb/>
              parts of the Earth downwards.</s>
            </p>
            <p type="main">
              <s>SIMP. </s>
              <s>The cauſe of this is moſt manifeſt, and every one knows
                <lb/>
              that it is gravity.</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>You are out,
                <emph type="italics"/>
              Simplicius,
                <emph.end type="italics"/>
              you ſhould ſay, that every
                <lb/>
              one knowes, that it is called Gravity: but I do not queſtion you
                <lb/>
              about the name, but the eſſence of the thing, of which eſſence
                <lb/>
              you know not a tittle more than you know the eſſence of the
                <lb/>
              mover of the ſtars in gyration; unleſſe it be the name that hath
                <lb/>
              been put to this, and made familiar, and domeſtical, by the many
                <lb/>
                <arrow.to.target n="marg415"/>
                <lb/>
              experiences which we ſee thereof every hour in the day,: but not
                <lb/>
              as if we really underſtand any more, what principle or vertue that
                <lb/>
              is which moveth a ſtone downwards, than we know who moveth
                <lb/>
              it upwards, when it is ſeparated from the projicient, or who
                <lb/>
              veth the Moon round, except (as I have ſaid) onely the name,
                <lb/>
              which more particularly and properly we have aſſigned to the
                <lb/>
              tion of deſcent, namely, Gravity; whereas for the cauſe of
                <lb/>
              cular motion, in more general termes, we aſſign the
                <emph type="italics"/>
              Vertue
                <lb/>
              ſed,
                <emph.end type="italics"/>
              and call the ſame an
                <emph type="italics"/>
              Intelligence,
                <emph.end type="italics"/>
              either aſſiſting, or informing;
                <lb/>
              and to infinite other motions we aſcribe Nature for their cauſe.</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg415"/>
                <emph type="italics"/>
              We know no more
                <lb/>
              who moveth grave
                <lb/>
              bodies downwards;
                <lb/>
              than who moveth
                <lb/>
              the Stars round,
                <lb/>
              nor know we any
                <lb/>
              thing of theſe
                <lb/>
              ſes, more than the
                <lb/>
              names impoſed on
                <lb/>
              them by us.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="main">
              <s>SIMP. </s>
              <s>It is my opinion, that this Author asketh far leſſe than
                <lb/>
              that, to which you deny to make anſwer; for he doth not ask
                <lb/>
              what is nominally and particularly the principle that moveth
                <lb/>
              grave and light bodies circularly, but whatſoever it be, he
                <lb/>
              reth to know, whether you think it intrinſecal, or extrinſecal:
                <lb/>
              For howbeit,
                <emph type="italics"/>
              v. </s>
              <s>gr.
                <emph.end type="italics"/>
              I do not know, what kind of thing that gravity
                <lb/>
              is, by which the Earth deſcendeth; yet I know that it is an intern </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>