Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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              AUCTORIS
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              PRÆFATIO
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              AD
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              LECTOREM.
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              </s>
            </p>
            <p type="main">
              <s>
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              CUM Veteres
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              Mechanicam (
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              uti Auctor eſt
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              Pappus)
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              in rerum
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              Naturalium inveſtigatione maximi fecerint; & Recentiores,
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              miſſis formis ſubſtantialibus & qualitatibus occultis, Phænomena
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              Naturæ ad leges Mathematicas revocare aggreſſi fint: Viſum eſt
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              in hoc Tractatu
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              Matheſin
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              excolere, quatenus ea ad
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              Philoſophiam
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                <emph type="italics"/>
              ſpectat.
                <emph.end type="italics"/>
              Mechanicam
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              vero duplicem Veteres conſtituerunt
                <emph.end type="italics"/>
              : Ra­
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              tionalem
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              quæ per Demonſtrationes accurate procedit, &
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              Practi­
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              cam.
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              Ad Practicam ſpectant Artes omnes Manuales, a quibus
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              utique
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              Mechanica
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              nomen mutuata eſt. </s>
              <s>Cum autem Artifices pa­
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              rum accurate operari ſoleant, fit ut
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              Mechanica
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              omnis a
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              Geome­
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              tria
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              ita diſtinguatur, ut quicquid accuratum ſit ad
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              Geometriam
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                <emph type="italics"/>
              referatur, quicquid minus accuratum ad
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              Mechanicam.
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              Attamen
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              errores non ſunt Artis ſed Artificum. </s>
              <s>Qui minus accurate ope­
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              ratur, imperfectior eſt Mechanicus, & ſi quis accuratiſſime ope­
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              rari poſſet, hic foret Mechanicus omnium perfectiſſimus. </s>
              <s>Nam &
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              Linearum rectarum & Circulorum deſcriptiones in quibus
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              Geo­
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              metria
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              fundatur, ad
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              Mechanicam
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              pertinent. </s>
              <s>Has lineas deſcri­
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              bere
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              Geometria
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              non docet ſed poſtulat. </s>
              <s>Poſtulat enim ut Tyro
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              eaſdem accurate deſcribere prius didicerit quam linen attingat
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                <lb/>
              Geometriæ;
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              dein, quomodo per has operationes Problemata ſol­
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              uantur, docet. </s>
              <s>Rectas & Circulos deſcribere Problemata ſunt,
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              </s>
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