Galilei, Galileo, The systems of the world, 1661

Table of figures

< >
< >
page |< < of 948 > >|
    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb xlink:href="065/01/404.jpg" pagenum="392"/>
                <arrow.to.target n="marg762"/>
                <lb/>
              tions; the one is its riſing and falling alternately towards the
                <lb/>
              one and other extremity; the other is its moving and running, to
                <lb/>
              ſo ſpeak, Horizontally forwards and backwards. </s>
              <s>Which two
                <lb/>
              ferent motions differently reſide in divers parts of the Water:
                <lb/>
              for its extream parts are thoſe which moſt eminently riſe and fall;
                <lb/>
              thoſe in the middle never abſolutely moving upwards and
                <lb/>
              wards, of the reſt ſucceſſively thoſe that are neereſt to the
                <lb/>
              treams riſe and fall proportionally more than the remote: but on
                <lb/>
              the contrary, touching the other progreſſive motion forwards
                <lb/>
              and backwards, the middle parts move notably, going and
                <lb/>
              turning, and the waters that are in the extream parts gain no
                <lb/>
              ground at all; ſave onely in caſe that in their riſing they
                <lb/>
              flow their banks, and break forth of their firſt channel and
                <lb/>
              ceptacle; but where there is the obſtacle of banks to keep them
                <lb/>
              in, they onely riſe and fall; which yet hindereth not the waters
                <lb/>
              in the middle from fluctuating to and again; which likewiſe
                <lb/>
              the other parts do in proportion, undulating more or leſſe,
                <lb/>
              according as they are neerer or more remote from the
                <lb/>
                <arrow.to.target n="marg763"/>
              </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg762"/>
                <emph type="italics"/>
              Water riſeth &
                <lb/>
              falleth in the
                <lb/>
              tream parts of the
                <lb/>
              Veſſel, and runneth
                <lb/>
              to and fro in the
                <lb/>
              midst.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg763"/>
                <emph type="italics"/>
              An accident of
                <lb/>
              the Earths motions
                <lb/>
              impoſſible to be
                <lb/>
              duced to practice
                <lb/>
              by art.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="main">
              <s>The fifth particular accident ought the more attentively to be
                <lb/>
              conſidered, in that it is impoſſible to repreſent the effect
                <lb/>
              of by an experiment or example; and the accident is this. </s>
              <s>In
                <lb/>
              the veſſels by us framed with art, and moved, as the
                <lb/>
              named Bark, one while more, and another while leſſe ſwiftly,
                <lb/>
              the acceleration and retardation is imparted in the ſame manner
                <lb/>
              to all the veſſel, and to every part of it; ſo that whilſt
                <emph type="italics"/>
              v. </s>
              <s>g.
                <emph.end type="italics"/>
              the
                <lb/>
              Bark forbeareth to move, the parts precedent retard no more
                <lb/>
              than the ſubſequent, but all equally partake of the ſame
                <lb/>
              tardment; and the ſelf-ſame holds true of the acceleration,
                <lb/>
              namely, that conferring on the Bark a new cauſe of
                <lb/>
              ter velocity, the Prow and Poop both accelerate in one and
                <lb/>
              the ſame manner. </s>
              <s>But in huge great veſſels, ſuch as are the very
                <lb/>
              long bottomes of Seas, albeit they alſo are no other than
                <lb/>
              tain cavities made in the ſolidity of the Terreſtrial Globe,
                <lb/>
              it alwayes admirably happeneth, that their extreams do not
                <lb/>
              unitedly equall, and at the ſame moments of time increaſe
                <lb/>
              and diminiſh their motion, but it happeneth that when one of its
                <lb/>
              extreames hath, by vertue of the commixtion of the two
                <lb/>
              Motions, Diurnal, and Annual, greatly retarded its velocity,
                <lb/>
              the other extream is animated with an extream ſwift motion.
                <lb/>
              </s>
              <s>Which for the better underſtanding of it we will explain,
                <lb/>
              ſuming a Scheme like to the former; in which if we do but
                <lb/>
              poſe a tract of Sea to be long,
                <emph type="italics"/>
              v. </s>
              <s>g.
                <emph.end type="italics"/>
              a fourth part, as is the arch
                <lb/>
              B C [
                <emph type="italics"/>
              in Fig.
                <emph.end type="italics"/>
              2.] becauſe the parts B are, as hath been already
                <lb/>
              declared, very ſwift in motion, by reaſon of the union of the
                <lb/>
              two motions diurnal and annual, towards one and the ſame way, </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
Impressum