Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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    <archimedes>
      <text>
        <body>
          <chap>
            <pb xlink:href="039/01/030.jpg" pagenum="2"/>
            <p type="main">
              <s>
                <emph type="center"/>
              DEFINITIO III.
                <emph.end type="center"/>
              </s>
            </p>
            <p type="main">
              <s>
                <emph type="italics"/>
              Materiæ Vis Inſita eſt potentia reſiſtendi, qua corpus unumquodque,
                <lb/>
              quantum in ſe eſt, perſeverat in ſtatu ſuo vel quieſcendi vel
                <lb/>
              movendi uniformiter in directum.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="main">
              <s>Hæc ſemper proportionalis eſt ſuo corpori, neQ.E.D.ffert quic­
                <lb/>
              quam ab Inertia maſſæ, niſi in modo concipiendi. </s>
              <s>Per inertiam
                <lb/>
              materiæ, fit ut corpus omne de ſtatu ſuo vel quieſcendi vel moven­
                <lb/>
              di difficulter deturbetur. </s>
              <s>Unde etiam vis inſita nomine ſignifican­
                <lb/>
              tiſſimo Vis Inertiæ dici poſſit. </s>
              <s>Exercet vero corpus hanc vim ſolum­
                <lb/>
              modo in mutatione ſtatus ſui per vim aliam in ſe impreſſam facta;
                <lb/>
                <expan abbr="eſtq;">eſtque</expan>
              exercitium ejus ſub diverſo reſpectu & Reſiſtentia & Impetus:
                <lb/>
              reſiſtentia, quatenus corpus ad conſervandum ſtatum ſuum relucta­
                <lb/>
              tur vi impreſſæ; impetus, quatenus corpus idem, vi reſiſtentis ob­
                <lb/>
              ſtaculi difficulter cedendo, conatur ſtatum ejus mutare. </s>
              <s>Vulgus
                <lb/>
              reſiſtentiam quieſcentibus & impetum moventibus tribuit: ſed mo­
                <lb/>
              tus & quies, uti vulgo concipiuntur, reſpectu ſolo diſtinguuntur
                <lb/>
              ab invicem;
                <expan abbr="neq;">neque</expan>
              ſemper vere quieſcunt quæ vulgo tanquam quie­
                <lb/>
              ſcentia ſpectantur. </s>
            </p>
            <p type="main">
              <s>
                <emph type="center"/>
              DEFINITIO IV.
                <emph.end type="center"/>
              </s>
            </p>
            <p type="main">
              <s>
                <emph type="center"/>
                <emph type="italics"/>
              Vis Impreſſa eſt actio in corpus exercita, ad mutandum ejus ſtatum
                <lb/>
              vel quieſcendi vel movendi uniformiter in directum.
                <emph.end type="italics"/>
                <emph.end type="center"/>
              </s>
            </p>
            <p type="main">
              <s>Conſiſtit hæc vis in actione ſola, neque poſt actionem permanet
                <lb/>
              in corpore. </s>
              <s>Perſeverat enim corpus in ſtatu omni novo per ſolam
                <lb/>
              vim inertiæ. </s>
              <s>Eſt autem vis impreſſa diverſarum originum, ut ex
                <lb/>
              Ictu, ex Preſſione, ex vi Centripeta. </s>
            </p>
            <p type="main">
              <s>
                <emph type="center"/>
              DEFINITIO V.
                <emph.end type="center"/>
              </s>
            </p>
            <p type="main">
              <s>
                <emph type="center"/>
                <emph type="italics"/>
              Vis Centripeta eſt, qua corpora verſus punctum aliquod tanquam ad
                <lb/>
              Centrum undique trahuntur, impelluntur, vel utcunque tendunt.
                <emph.end type="italics"/>
                <emph.end type="center"/>
              </s>
            </p>
            <p type="main">
              <s>Hujus generis eſt Gravitas, qua corpora tendunt ad centrum ter­
                <lb/>
              ræ; Vis Magnetica, qua ferrum petit magnetem; & Vis illa,
                <lb/>
                <expan abbr="quæcunq;">quæcunque</expan>
              ſit, qua Planetæ perpetuo retrahuntur a motibus rectili­
                <lb/>
              neis, & in lineis curvis revolvi coguntur. </s>
              <s>Lapis, in funda circum-</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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