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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          <p>
            <s xml:id="echoid-s11164" xml:space="preserve">
              <pb o="480" file="0494" n="494" rhead="INTRODUCTIO AD COHÆRENTIAM"/>
            quibus omne ratiocinium ſcientiæ realis de ſolidorum reſiſtentia
              <lb/>
            ſuperſtruendum eſt, imo a quibus ordiendum eſt. </s>
            <s xml:id="echoid-s11165" xml:space="preserve">Ut autem bono
              <lb/>
            ordine dirigantur noſtri labores, in anteceſſum deſcribam metho-
              <lb/>
            dum, qua in examine Cohærentiæ ſolidorum uſus fui, ut conſtet, an Ex-
              <lb/>
            perimenta accurate ſint inſtituta, an fidem & </s>
            <s xml:id="echoid-s11166" xml:space="preserve">aſſenſum mereantur, aut
              <lb/>
            an in iis major cautela & </s>
            <s xml:id="echoid-s11167" xml:space="preserve">ad plures circumſtantias attentio deſideretur.</s>
            <s xml:id="echoid-s11168" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s11169" xml:space="preserve">Acturus de corporum Cohærentiâ, primo ſecutus fui me-
              <lb/>
            thodum ingenioſiſſimi Mariotti, deſcriptam in Libro de Mo-
              <lb/>
            tu Aquarum part. </s>
            <s xml:id="echoid-s11170" xml:space="preserve">5. </s>
            <s xml:id="echoid-s11171" xml:space="preserve">ſerm. </s>
            <s xml:id="echoid-s11172" xml:space="preserve">2. </s>
            <s xml:id="echoid-s11173" xml:space="preserve">quæ hæc eſt; </s>
            <s xml:id="echoid-s11174" xml:space="preserve">vid Tab XVIII. </s>
            <s xml:id="echoid-s11175" xml:space="preserve">fig 8.
              <lb/>
            </s>
            <s xml:id="echoid-s11176" xml:space="preserve">Sumebatur Cylindrus ex ligno ſicco â tornione elaboratus, cujus
              <lb/>
            diameter erat {3/12} pollic: </s>
            <s xml:id="echoid-s11177" xml:space="preserve">extremitates deſinebant in capita majora
              <lb/>
            A, B, quos funes ambibant, qui alia methodo adnecti cylindro
              <lb/>
            firmiter non potuiſſent, quin citius ab extremitatibus remoti fuiſ-
              <lb/>
            ſent, quam quidem cylindrus diffringeretur: </s>
            <s xml:id="echoid-s11178" xml:space="preserve">caput ſupremum A me-
              <lb/>
            dium intra 4 funes ſuſpendebatur, qui trabi L annectebantur: </s>
            <s xml:id="echoid-s11179" xml:space="preserve">ex funi-
              <lb/>
            bus caput inferius B cingentibus appendebatur pondus C, quod in
              <lb/>
            initio exiguum. </s>
            <s xml:id="echoid-s11180" xml:space="preserve">augebatur ſucceſſive, donec cylindrus D B frange-
              <lb/>
            batur: </s>
            <s xml:id="echoid-s11181" xml:space="preserve">Mariottus inſtituens Experimentum cum cylindro ligneo,
              <lb/>
            deprehendit id ſuſtinuiſſe pondus 330 librar. </s>
            <s xml:id="echoid-s11182" xml:space="preserve">addere tamen ob-
              <lb/>
            litus fuit ex quonam genere lignum fuerit. </s>
            <s xml:id="echoid-s11183" xml:space="preserve">In hac methodo id in-
              <lb/>
            commodi deprehendi, quod pedes illius, qui Experimenta inſti-
              <lb/>
            tuebat, ſemper periculo læſionis exponebantur, cadente pondere C. </s>
            <s xml:id="echoid-s11184" xml:space="preserve">
              <lb/>
            2°, difficillimum eſt aliquot centenas libras Lanci imponere,
              <lb/>
            cum plurimorum diverſorumque corporum Cohærentia exploratur: </s>
            <s xml:id="echoid-s11185" xml:space="preserve">
              <lb/>
            3°. </s>
            <s xml:id="echoid-s11186" xml:space="preserve">aliquando etiam tenuis Ligni firmitas ſuperat craſſiorum funium
              <lb/>
            robur; </s>
            <s xml:id="echoid-s11187" xml:space="preserve">4°. </s>
            <s xml:id="echoid-s11188" xml:space="preserve">funes novi, aut tempeſtate humida quilibet, ſunt ni-
              <lb/>
            mis rigidi, quam ut bene circa capita A, B, flectantur: </s>
            <s xml:id="echoid-s11189" xml:space="preserve">5°. </s>
            <s xml:id="echoid-s11190" xml:space="preserve">novi quo-
              <lb/>
            que funes a ponderibus majoribus annexis valde quam elongantur,
              <lb/>
            ita ut ſuſpenſio ex Trabe L mutanda ſit aliquando; </s>
            <s xml:id="echoid-s11191" xml:space="preserve">quod & </s>
            <s xml:id="echoid-s11192" xml:space="preserve">difficile, & </s>
            <s xml:id="echoid-s11193" xml:space="preserve">
              <lb/>
            multum tædii laboriſque affert, ſimulque tempus nimis protrahendo
              <lb/>
            inutiliter conſumit: </s>
            <s xml:id="echoid-s11194" xml:space="preserve">Quamobrem his incommodis obſervatis Ma-
              <lb/>
            riotti methodum rejeci, animumque ad aliam iis expertem appli-
              <lb/>
            cui; </s>
            <s xml:id="echoid-s11195" xml:space="preserve">quæ ex voto ſucceſſit, & </s>
            <s xml:id="echoid-s11196" xml:space="preserve">ut fit inter tentantum, addendo o-
              <lb/>
            miſſa, immutando quæ obſtabant, emendandoque difficiliora, tan-
              <lb/>
            dem apparatum conſtruxi, qui commodiſſimus Cohærentiis abſo-
              <lb/>
            lutis quorumcunque ſolidorum examinandis revera deprehenſus fuit</s>
          </p>
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      </text>
    </echo>
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