Musschenbroek, Petrus van, Physicae experimentales, et geometricae de magnete, tuborum capillarium vitreorumque speculorum attractione, magnitudine terrae, cohaerentia corporum firmorum dissertationes: ut et ephemerides meteorologicae ultraiectinae

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          <head xml:id="echoid-head447" xml:space="preserve">INTRODUCTIO
            <lb/>
            <emph style="sc">AD</emph>
            <lb/>
          COHÆRENTIAM
            <lb/>
          CORPORUM FIRMORUM.</head>
          <head xml:id="echoid-head448" xml:space="preserve">PRÆFATIO.</head>
          <p>
            <s xml:id="echoid-s9423" xml:space="preserve">Mechanica duas videtur habere partes, quarum una agens
              <lb/>
            de Potentiis moventibus, tradit regulas, quibus omnia
              <lb/>
            corpora motu percita ſubjiciuntur; </s>
            <s xml:id="echoid-s9424" xml:space="preserve">hanc partem plurimi
              <lb/>
            Philoſophi & </s>
            <s xml:id="echoid-s9425" xml:space="preserve">Mathematici, antiqui & </s>
            <s xml:id="echoid-s9426" xml:space="preserve">recentiores im-
              <lb/>
            penſe coluerunt, & </s>
            <s xml:id="echoid-s9427" xml:space="preserve">indies expoliunt, adeo ut hac tempeſtate The-
              <lb/>
            ma Mechanicæ nobiliſſimum, de quo ſubtiliſſime diſputatur, eva-
              <lb/>
            ſerit. </s>
            <s xml:id="echoid-s9428" xml:space="preserve">Sed altera pars Mechanicæ, quæ Reſiſtentias ſive Cohæren-
              <lb/>
            tias corporum examinat, pauciſſimos nacta fuit cultores: </s>
            <s xml:id="echoid-s9429" xml:space="preserve">Hanc,
              <lb/>
            Mechanicorum Princeps, Archimedes, intactam reliquit, nec ad
              <lb/>
            eam Priscorumullus animum applicuit: </s>
            <s xml:id="echoid-s9430" xml:space="preserve">Profecto admirandum! cum
              <lb/>
            hæc ſcientia utiliſſima & </s>
            <s xml:id="echoid-s9431" xml:space="preserve">perquam neceſſaria ſit in plurimis artibus,
              <lb/>
            imo fere in tota vita civili, ut probatu facillimum foret; </s>
            <s xml:id="echoid-s9432" xml:space="preserve">ſed ex
              <lb/>
            Mechanica atque Architectura vulgatiſſima exempla ſufficiant.</s>
            <s xml:id="echoid-s9433" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s9434" xml:space="preserve">Quotieſcunque conſtruenda eſt inſignior compoſitaque ex multis
              <lb/>
            partibus Machina, ſolet â prudentioribus Architectis exiguum prius
              <lb/>
            fabrefieri prototypon, ut omnes forte oboriundæ difficultates ſu-
              <lb/>
            perentur, defectus minus præviſi ſuppleantur, male ordinata emen-
              <lb/>
            dentur, ne inutilis labor aut impenſæ ſupervacuæ fiant: </s>
            <s xml:id="echoid-s9435" xml:space="preserve">Sæpius e-
              <lb/>
            venit, ut exiguum prototypon omnibus perfectum ſit partibus. </s>
            <s xml:id="echoid-s9436" xml:space="preserve">ſa-
              <lb/>
            tis mobilibus firmisque, machina interim majori ſecundum illius
              <lb/>
            proportionem elaborata nequaquam valente propter partes nonnul-
              <lb/>
            las hinc inde minus firmas, quam ut vim iis applicandam </s>
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