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

Page concordance

< >
Scan Original
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
< >
page |< < of 77 > >|
    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb pagenum="424"/>
              but that the Winde oppoſite to the South may do the ſame, but only
                <lb/>
              affirmeth that the force of the Water prevailing over the
                <lb/>
              Wind, the Bark ſhall move towards the South: and ſaith no more
                <lb/>
              than is true. </s>
              <s>And juſt thus when
                <emph type="italics"/>
              Archimedes
                <emph.end type="italics"/>
              ſaith, that the Gravity
                <lb/>
              of the Water prevailing over that by which the moveable deſcends to
                <lb/>
              the Bottom, ſuch moveable ſhall be raiſed from the Bottom to the
                <lb/>
              face alledgeth a very true Cauſe of ſuch an Accident, nor doth he
                <lb/>
              firm or deny that there is, or is not, a vertue contrary to Gravity, called
                <lb/>
              by ſome Levity, that hath alſo a power of moving ſome Matters up
                <lb/>
              wards. </s>
              <s>Let therefore the Weapons of
                <emph type="italics"/>
              Signor Buonamico
                <emph.end type="italics"/>
              be directed
                <lb/>
                <arrow.to.target n="marg1439"/>
                <lb/>
              gainſt
                <emph type="italics"/>
              Plato,
                <emph.end type="italics"/>
              and other
                <emph type="italics"/>
              Ancients,
                <emph.end type="italics"/>
              who totally denying
                <emph type="italics"/>
              Levity,
                <emph.end type="italics"/>
              and taking
                <lb/>
              all Bodies to be grave, ſay that the Motion upwards is made, not
                <lb/>
              from an intrinſecal Principle of the Moveable, but only by the
                <lb/>
              pulſe of the
                <emph type="italics"/>
              Medium
                <emph.end type="italics"/>
              ; and let
                <emph type="italics"/>
              Archimedes
                <emph.end type="italics"/>
              and his Doctrine eſcape
                <lb/>
              him, ſince he hath given him no Cauſe of quarelling with him
                <lb/>
              But if this Apologie, produced in defence of
                <emph type="italics"/>
              Archimedes,
                <emph.end type="italics"/>
              ſhould ſeen
                <lb/>
              to ſome inſufficient to free him from the Objections and Arguments
                <lb/>
              produced by
                <emph type="italics"/>
              Ariſtotle
                <emph.end type="italics"/>
              againſt
                <emph type="italics"/>
              Plato,
                <emph.end type="italics"/>
              and the other
                <emph type="italics"/>
              Ancients,
                <emph.end type="italics"/>
              as if they
                <lb/>
              did alſo fight againſt
                <emph type="italics"/>
              Archimedes,
                <emph.end type="italics"/>
              alledging the Impulſe of the Water
                <lb/>
                <arrow.to.target n="marg1440"/>
                <lb/>
              as the Cauſe of the ſwimming of ſome Bodies leſs grave than it, I would
                <lb/>
              not queſtion, but that I ſhould be able to maintaine the Doctrine of
                <lb/>
                <emph type="italics"/>
              Plato
                <emph.end type="italics"/>
              and thoſe others to be moſt true, who abſolutely deny Levity,
                <lb/>
              and affirm no other Intrinſecal Principle of Motion to be in
                <lb/>
              tary Bodies ſave only that towards the Centre of the Earth, nor no
                <lb/>
                <arrow.to.target n="marg1441"/>
                <lb/>
              other Cauſe of moving upwards, ſpeaking of that which hath the
                <lb/>
              ſemblance of natural Motion, but only the repulſe of the
                <emph type="italics"/>
              Medium,
                <emph.end type="italics"/>
              ſluid,
                <lb/>
              and exceeding the Gravity of the Moveable: and as to the Reaſons
                <lb/>
              of
                <emph type="italics"/>
              Ariſtotle
                <emph.end type="italics"/>
              on the contrary, I believe that I could be able fully to
                <lb/>
                <arrow.to.target n="marg1442"/>
                <lb/>
              anſwer them, and I would aſſay to do it, if it were abſolutely
                <lb/>
              ry to the preſent Matter, or were it not too long a Digreſſion for this
                <lb/>
              ſhort Treatiſe. </s>
              <s>I will only ſay, that if there were in ſome of our
                <lb/>
              mentary Bodies an Intrinſecall Principle and Naturall Inclination
                <lb/>
              to ſhun the Centre of the Earth, and to move towards the Concave
                <lb/>
              of the Moon, ſuch Bodies, without doubt, would more ſwiftly aſcend
                <lb/>
              through thoſe
                <emph type="italics"/>
              Mediums
                <emph.end type="italics"/>
              that leaſt oppoſe the Velocity of the Moveable,
                <lb/>
              and theſe are the more tenuous and ſubtle; as is, for example, the
                <lb/>
              Air in compariſon of the Water, we daily proving that we can with
                <lb/>
                <arrow.to.target n="marg1443"/>
                <lb/>
              farre more expeditious Velocity move a Hand or a Board to and
                <lb/>
              gain in one than in the other: nevertheleſs, we never could finde any
                <lb/>
              Body, that did not aſcend much more ſwiftly in the water than in the
                <lb/>
                <arrow.to.target n="marg1444"/>
                <lb/>
              Air. </s>
              <s>Yea of Bodies which we ſee continually to aſcend in the Water,
                <lb/>
              there is none that having arrived to the confines of the Air, do not
                <lb/>
              ly loſe their Motion; even the Air it ſelf, which riſing with great
                <lb/>
              lerity through the Water, being once come to its Region it loſeth all</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>