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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            <s xml:id="echoid-s16995" xml:space="preserve">
              <pb o="669" file="0685" n="686" rhead="CORPORUM FIRMORUM."/>
            mentum LXXXI. </s>
            <s xml:id="echoid-s16996" xml:space="preserve">ex quo patet Cylindrum vitreum, diametri 0,
              <lb/>
            23 poll. </s>
            <s xml:id="echoid-s16997" xml:space="preserve">fractum a libris 118, aliudque diametri 0, 25 pollic ru-
              <lb/>
            ptum a libris 150: </s>
            <s xml:id="echoid-s16998" xml:space="preserve">ſed in Experimento LXXXVI. </s>
            <s xml:id="echoid-s16999" xml:space="preserve">funis cannabi-
              <lb/>
            nus circumferentiæ 0, 6 pollicum ferre potuit libris 210. </s>
            <s xml:id="echoid-s17000" xml:space="preserve">hujus craſ-
              <lb/>
            ſities nondum vitrum adæquabat: </s>
            <s xml:id="echoid-s17001" xml:space="preserve">in Experimento C chorda inte-
              <lb/>
            ſtinalis diametri 0, 0 3 pollicis tenuit libras 27. </s>
            <s xml:id="echoid-s17002" xml:space="preserve">ſi igitur hæc dia-
              <lb/>
            metrum 0, 23 pollicis habuiſſet, uti vitri cylindrus, fuiſſet plus-
              <lb/>
            quam ſepties major, quam proinde 50 ejuſinodi chordæ circiter
              <lb/>
            conſtituiſſent, quæ tenuiſſent pondus librarum 1350. </s>
            <s xml:id="echoid-s17003" xml:space="preserve">Serici Co-
              <lb/>
            hærentia non minor fuiſſet: </s>
            <s xml:id="echoid-s17004" xml:space="preserve">quamobrem evidentiſſimum eſt Cohæ-
              <lb/>
            rentiam maſſæ totius corpus durum componentis non ſemper ſu-
              <lb/>
            perare eam, quam mollia habent.</s>
            <s xml:id="echoid-s17005" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s17006" xml:space="preserve">Ex hoc exemplo ſequitur, Cohærentiam lateralem partium cor-
              <lb/>
            poris duri eſſe majorem quam in molli, ſed longitudinalem ſirmi-
              <lb/>
            tatem ſuperari in duro ab ea, quam mollia nonnulla habent.</s>
            <s xml:id="echoid-s17007" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s17008" xml:space="preserve">Si Microſcopiorum ope corporum horum partes, fabricam,
              <lb/>
            ſitum, nexumque intueri liceret, ratio dari poſſet, quare hæc ita
              <lb/>
            ſe habeant, verum viſu nos hic deſtituente, non nifi conjecturis
              <lb/>
            relinqueretur locus, â quibus merito abſtinemus.</s>
            <s xml:id="echoid-s17009" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s17010" xml:space="preserve">Cum igitur corporum durities ſit etiam Cohærentia partium,
              <lb/>
            ſed magis lateralis, quam ſecundum fibrarum longitudinem, ani
              <lb/>
            mo volutare coepi, an quantitas Duritiei non poſſet ad examen vo-
              <lb/>
            cari, talia meditanti nihil diſſicilius viſum fuit; </s>
            <s xml:id="echoid-s17011" xml:space="preserve">diverſiſſimis igi-
              <lb/>
            tur methodis propoſitis, rejectiſque iterum, tandem incidi in
              <lb/>
            ſequentem, quæ licet omnium viſa fuerit optima, nihilominus
              <lb/>
            plurimis obnoxia eſt difficultatibus, admodum compoſita, nec adeo
              <lb/>
            accurata ac ipſe deſideraviſſem: </s>
            <s xml:id="echoid-s17012" xml:space="preserve">ſi proinde Eruditis non penitus
              <lb/>
            ſatisfaciat, hi ſciant, nec eam mihi ſatisfeciſſe; </s>
            <s xml:id="echoid-s17013" xml:space="preserve">id tantum ex-
              <lb/>
            optans, ut melior inveniatur, atque hactenus adeo incognita du-
              <lb/>
            rities corporum in veſtigetur majori curâ.</s>
            <s xml:id="echoid-s17014" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s17015" xml:space="preserve">Ex diverſis lignorum generibus præparata ſunt exigua parallelo-
              <lb/>
            pipeda quadrangula, æque craſſa, quorum quodlibet latus fuit 0,
              <lb/>
            15 pollicis, qualia quoque ex metallis ſunt confecta, cum duri-
              <lb/>
            ties transverſe ſuam Cohærentiam oſtendat, hæc tranſverſe eodem
              <lb/>
            cuneo diſſecanda eſſe ratus fui; </s>
            <s xml:id="echoid-s17016" xml:space="preserve">ictus vero mallei incidentis in cu-
              <lb/>
            neum frequentiores deſiderari, ut corpus durum ſecetur, </s>
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