Galilei, Galileo, Discourse concerning the natation of bodies, 1663

List of thumbnails

< >
71
71 		72
72
73
73 		74
74
75
75 		76
76
77
77
< >
page |< < of 77 > >|
    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb pagenum="475"/>
              ved at the Air, ſtayeth there, and hardly toucheth it; whence I may
                <lb/>
              aswell ſay, that the water is more eaſier divided than the Air</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1546"/>
                <emph type="italics"/>
              Archimed. </s>
              <s>De
                <lb/>
              Inſident, humi
                <emph.end type="italics"/>
              lib.
                <lb/>
              </s>
              <s>2. prop. 1.</s>
            </p>
            <p type="main">
              <s>I will not on this occaſion forbear to give warning of another
                <lb/>
              lacy of theſe perſons, who attribute the reaſon of ſinking or ſwimming
                <lb/>
              to the greater or leſſe Reſiſtance of the Craſſitude of the water againſt
                <lb/>
              Diviſion, making uſe of the example of an Egg, which in ſweet water
                <lb/>
              goeth to the bottom, but in ſalt water ſwims; and alledging for the
                <lb/>
              cauſe thereof, the faint Reſiſtance of freſh water againſt Diviſion, and
                <lb/>
              the ſtrong Reſiſtance of ſalt water But if I miſtake not, from the ſame
                <lb/>
              Experiment, we may aswell deduce the quite contrary; namely, that
                <lb/>
              the freſh water is more denſe, and the ſalt more tenuous and ſubtle,
                <lb/>
              ſince an Egg from the bottom of ſalt water ſpeedily aſcends to the
                <lb/>
              top, and divides its Reſiſtance, which it cannot do in the freſh, in whoſe
                <lb/>
              bottom it ſtays, being unable to riſe upwards. </s>
              <s>Into ſuch like
                <lb/>
              ities, do falſe Principles Lead men: but he that rightly Philoſophating,
                <lb/>
              ſhall acknowledge the exceſſes of the Gravities of the Moveables and
                <lb/>
              of the Mediums, to be the Cauſes of thoſe effects, will ſay, that the
                <lb/>
              Egg ſinks to the bottom in freſh water, for that it is more grave than
                <lb/>
              it, and ſwimeth in the ſalt, for that its leſs grave than it: and ſhall
                <lb/>
              without any abſurdity, very ſolidly eſtabliſh his Concluſions.</s>
            </p>
            <p type="main">
              <s>Therefore the reaſon totally ceaſeth, that
                <emph type="italics"/>
              Ariſtotle
                <emph.end type="italics"/>
              ſubjoyns in the
                <lb/>
                <arrow.to.target n="marg1547"/>
                <lb/>
              Text ſaying; The things, therefore, which have great breadth remain
                <lb/>
              above, becauſe they comprehend much, and that which is greater,
                <lb/>
              is not eaſily divided. </s>
              <s>Such diſcourſing ceaſeth, I ſay, becauſe its not
                <lb/>
              true, that there is in water or in Air any Reſiſtance of Diviſion;
                <lb/>
              ſides that the Plate of Lead when it ſtays, hath already divided and
                <lb/>
              penetrated the Craſſitude of the water, and profounded it ſelf ten or
                <lb/>
              twelve times more than its own thickneſs: beſides that ſuch Reſiſtance
                <lb/>
              of Diviſion, were it ſuppoſed to be in the water, could not rationally
                <lb/>
              be affirmed to be more in its ſuperiour parts than in the middle, and
                <lb/>
              lower: but if there were any difference, the inferiour ſhould be the
                <lb/>
              more denſe, ſo that the Plate would be no leſs unable to penetrate
                <lb/>
              the lower, than the ſuperiour parts of the water; nevertheleſs we ſee
                <lb/>
              that no ſooner do we wet the ſuperious Superficies of the Board or
                <lb/>
              thin Piece of Wood, but it precipitatly, and without any retenſion,
                <lb/>
              deſcends to the bottom.</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1547"/>
              Text 45.</s>
            </p>
            <p type="main">
              <s>I believe not after all this, that any (thinking perhaps thereby to
                <lb/>
              defend
                <emph type="italics"/>
              Aristotle
                <emph.end type="italics"/>
              ) will ſay, that it being true, that the much water
                <lb/>
              ſiſts more than the little, the ſaid Board being put lower deſcendeth,
                <lb/>
              becauſe there remaineth a leſs Maſs of water to be divided by it:
                <lb/>
              cauſe if after the having ſeen the ſame Board ſwim in four Inches of
                <lb/>
              water, and alſo after that in the ſame to ſink, he ſhall try the ſame
                <lb/>
              Experiment upon a profundity of ten or twenty fathom water, he
                <lb/>
              ſhall ſee the very ſelf ſame effect. </s>
              <s>And here I will take occaſion to </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
Impressum