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

List of thumbnails

< >
311
311 		312
312
313
313 		314
314
315
315 		316
316
317
317 		318
318
319
319 		320
320
< >
page |< < of 701 > >|
    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb xlink:href="040/01/383.jpg" pagenum="363"/>
              ſuch velocity, that they both finiſh one revolution in the ſame
                <lb/>
              time preciſely. </s>
              <s>You may ſee this admirable, and to our
                <lb/>
                <arrow.to.target n="marg690"/>
                <lb/>
              poſe accommodate experience, if putting in a Baſon of water a
                <lb/>
              Ball that will ſwim; and holding the Baſon in your hand, you
                <lb/>
              turn round upon your toe, for you ſhall immediatly ſee the Ball
                <lb/>
              begin to revolve in it ſelf with a motion, contrary to that of the
                <lb/>
              Baſon, and it ſhall finiſh its revolution, when that of the Baſon it
                <lb/>
              ſhall finiſh. </s>
              <s>Now what other is the Earth than a penſil Globe
                <lb/>
              librated in tenuous and yielding aire, which being carried
                <lb/>
              bout in a year along the circumference of a great circle, muſt
                <lb/>
                <arrow.to.target n="marg691"/>
                <lb/>
              needs acquire, without any other mover, a revolution about its
                <lb/>
              own centre, annual, and yet contrary to the other motion in like
                <lb/>
              manner annual? </s>
              <s>You ſhall ſee this effect I ſay, but if afterwards
                <lb/>
              you more narrowly conſider it, you ſhall find this to be no real
                <lb/>
              thing, but a meer appearance; and that which you think to be
                <lb/>
              a revolution in it ſelf, you will find to be a not moving at all,
                <lb/>
              but a continuing altogether immoveable in reſpect of all that
                <lb/>
              which without you, and without the veſſel is immoveable: for if in
                <lb/>
              that Ball you ſhall make ſome mark, and conſider to what part of
                <lb/>
              the Room where you are, or of the Field, or of Heaven it is
                <lb/>
              ſituate, you ſhall ſee that mark in yours, and the veſſels
                <lb/>
              tion to look alwayes towards that ſame part; but comparing it to
                <lb/>
              the veſſel and to your ſelf that are moveable, it will appear to go
                <lb/>
              altering its direction, and with a motion contrary to yours, and
                <lb/>
              that of the veſſel, to go ſeeking all the points of its
                <lb/>
              tion; ſo that with more reaſon you and the baſon may be ſaid
                <lb/>
              to turn round the immoveable Ball, than that it moveth round
                <lb/>
              in the baſon. </s>
              <s>In the ſame manner the Earth ſuſpended and
                <lb/>
              brated in the circumference of the Grand Orbe, and ſcituate in
                <lb/>
              ſuch ſort that one of its notes, as for example, its North Pole,
                <lb/>
              keth towards ſuch a Star or other part of the Firmament, it always
                <lb/>
              keepeth directed towards the ſame, although carried round by
                <lb/>
              the annual motion about the circumference of the ſaid Grand
                <lb/>
              Orbe. </s>
              <s>This alone is ſufficient to make the Wonder ceaſe, and
                <lb/>
              to remove all difficulties. </s>
              <s>But what will
                <emph type="italics"/>
              Simplicius
                <emph.end type="italics"/>
              ſay, if to
                <lb/>
              this non-indigence of the co-operating cauſe we ſhould adde
                <lb/>
              an admirable intrinſick vertue of the Terreſtrial Globe, of
                <lb/>
                <arrow.to.target n="marg692"/>
                <lb/>
              ing with its determinate parts towards determinate parts of the
                <lb/>
              Firmament, I ſpeak of the Magnetick vertue conſtantly
                <lb/>
              pated by any whatſoever piece of Loade-ſtone. </s>
              <s>And if every
                <lb/>
              minute particle of that S one have in it ſuch a vertue, who will
                <lb/>
                <arrow.to.target n="marg693"/>
                <lb/>
              queſtion but that the ſame more powerfully reſides in this whole
                <lb/>
              Terreſtrial Globe, abounding in that Magnetick matter, and
                <lb/>
              which happily it ſelf, as to its internal and primary ſubſtance, is
                <lb/>
              nothing elſe but a huge maſſe of Loade-ſtone.</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
Impressum