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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              <pb o="535" file="0549" n="549" rhead="CORPORUM FIRMORUM."/>
            obſervatur diſtantia lineæ directionis ponderis a foramine, quæ di-
              <lb/>
            ſtantiatamen accuratiſſime eſt notanda, ut Cohærentiæ abſolutæ & </s>
            <s xml:id="echoid-s12582" xml:space="preserve">
              <lb/>
            reſpectivæ proportio eruatur: </s>
            <s xml:id="echoid-s12583" xml:space="preserve">at ope hujus tabulæ facillime & </s>
            <s xml:id="echoid-s12584" xml:space="preserve">abſ-
              <lb/>
            que errore conſpicitur directionis ponderis diſtantia.</s>
            <s xml:id="echoid-s12585" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s12586" xml:space="preserve">Præterea tabulam præparaveram, ut ſupra eam depingerem curvas,
              <lb/>
            quas qualibet inflexione corpora deſcriberent, ut obſervaretur, an
              <lb/>
            omnes ejuſdem naturæ, an diverſæ forent, & </s>
            <s xml:id="echoid-s12587" xml:space="preserve">quænam tum obtinerent:
              <lb/>
            </s>
            <s xml:id="echoid-s12588" xml:space="preserve">unam enim ingenioſiſſimus Bernouillius examinaverat in L’ Hiſt. </s>
            <s xml:id="echoid-s12589" xml:space="preserve">
              <lb/>
            de L’ Acad. </s>
            <s xml:id="echoid-s12590" xml:space="preserve">Roy. </s>
            <s xml:id="echoid-s12591" xml:space="preserve">A° 1705. </s>
            <s xml:id="echoid-s12592" xml:space="preserve">cujus pulcerrimas proprietates detexe-
              <lb/>
            rat: </s>
            <s xml:id="echoid-s12593" xml:space="preserve">Sed in hiſce obſervandis mihi non ſatisfeci, quia lignorum
              <lb/>
            inflexio diu manet in motu ab eodem pondere, atque perpetuo
              <lb/>
            quaſi mutatur, cum fibræ corpus componentes non ſimul ex ſe mu-
              <lb/>
            tuo extrahuntur, quantum debent, ſed ſucceſſu temporis magis
              <lb/>
            magiſque ſolvuntur: </s>
            <s xml:id="echoid-s12594" xml:space="preserve">Si tamen rudem obſervationem afferre liceat,
              <lb/>
            quam fateor non ſecundum rigorem Mathematicum eſſe accipien-
              <lb/>
            dam; </s>
            <s xml:id="echoid-s12595" xml:space="preserve">Tot formantur curvæ diverſæ a ponderibus appenſis, quot diver-
              <lb/>
            ſa Ligna exploravi. </s>
            <s xml:id="echoid-s12596" xml:space="preserve">Ligna quæ examinibus inſervierunt, erant eadem
              <lb/>
            ac in Capite II. </s>
            <s xml:id="echoid-s12597" xml:space="preserve">adhibita, quæ eum in finem tantæ longitudinis
              <lb/>
            fumta fuerunt, ut iterum in hiſce tentaminibus explorarentur: </s>
            <s xml:id="echoid-s12598" xml:space="preserve">
              <lb/>
            quamvis quoque alia nova, earundemque arborum ligna præpara-
              <lb/>
            verim; </s>
            <s xml:id="echoid-s12599" xml:space="preserve">nam fibræ lignorum in Cap. </s>
            <s xml:id="echoid-s12600" xml:space="preserve">II. </s>
            <s xml:id="echoid-s12601" xml:space="preserve">examinatorum erant parum
              <lb/>
            ex ſe mutuo extractæ, adeoque hinc inde neceſſario fractæ fue-
              <lb/>
            runt, quod non poterat non Cohærentiam minorem verâ in ſe-
              <lb/>
            cundo tentamine exhibere: </s>
            <s xml:id="echoid-s12602" xml:space="preserve">nova ligna non audebam ſubſtituere exa-
              <lb/>
            minatis, quia etiamſi ex eadem arbore fuerint capta, nihilominus
              <lb/>
            ex alia parte depromebantur, quam non poteram ponere ejuſdem
              <lb/>
            eſſe Cohærentiæ cum alia; </s>
            <s xml:id="echoid-s12603" xml:space="preserve">imo infra oſtendam, hunc ſcrupulum va-
              <lb/>
            num non eſſe, atque ex eodem aſl
              <unsure/>
            ere partes, in diverſa a meditullio
              <lb/>
            diſtantiâ ſumtas, varia firmitate donari: </s>
            <s xml:id="echoid-s12604" xml:space="preserve">non tamen notabilem diſ-
              <lb/>
            crepantiam in hiſce Experimentis obſervavi, uti conſtabit in eorum
              <lb/>
            deſcriptis eventibus.</s>
            <s xml:id="echoid-s12605" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s12606" xml:space="preserve">Ligna duplicis facta ſunt figuræ, cylindrica & </s>
            <s xml:id="echoid-s12607" xml:space="preserve">parallelopipeda,
              <lb/>
            qualia exhibet Tab. </s>
            <s xml:id="echoid-s12608" xml:space="preserve">XX. </s>
            <s xml:id="echoid-s12609" xml:space="preserve">fig. </s>
            <s xml:id="echoid-s12610" xml:space="preserve">5 & </s>
            <s xml:id="echoid-s12611" xml:space="preserve">6. </s>
            <s xml:id="echoid-s12612" xml:space="preserve">extremitas donabatur exiguo
              <lb/>
            capite A, impedituro ne funis, ex quo pondus pendebat, decide-
              <lb/>
            ret ab extremitate inflexi aliquousque ligni.</s>
            <s xml:id="echoid-s12613" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s12614" xml:space="preserve">Omnia ex fractis in Capite II. </s>
            <s xml:id="echoid-s12615" xml:space="preserve">confecta longitudinem 6 </s>
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