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-s16406" xml:space="preserve">
              <pb o="645" file="0661" n="662" rhead="CORPORUM FIRMORUM."/>
            iisdem obſervatur corporibus utrimque a fulcro exceptis, idque
              <lb/>
            collegit, quia in duobus locis ſimul franguntur prope foramina,
              <lb/>
            cum ea, quæ libere a fulcris ſuſtinentur, modo frangantur in me-
              <lb/>
            dio: </s>
            <s xml:id="echoid-s16407" xml:space="preserve">Sumſit virgam vitream diametri {3/4} lineæ, quam utrimque fo-
              <lb/>
            raminibus 9 pollices a ſe diſtantibus infixit, pondus libr. </s>
            <s xml:id="echoid-s16408" xml:space="preserve">3. </s>
            <s xml:id="echoid-s16409" xml:space="preserve">& </s>
            <s xml:id="echoid-s16410" xml:space="preserve">un-
              <lb/>
            ciæ 1 ex medio ſuſpenſum hanc in duobus locis fregit; </s>
            <s xml:id="echoid-s16411" xml:space="preserve">cum ejuſ-
              <lb/>
            modi virga vitrea libere impoſita fulcris, 9 pollices â ſe remotis,
              <lb/>
            in medio rupta fuit a libris 1 {3/4}, quod pondus eſt fere dimidium prio-
              <lb/>
            ris: </s>
            <s xml:id="echoid-s16412" xml:space="preserve">non dubito de hoc Experimento, verum ex uno non licet Uni-
              <lb/>
            verſalem regulam deducere; </s>
            <s xml:id="echoid-s16413" xml:space="preserve">ſi Mariottus plura tentamina feciſſet,
              <lb/>
            nobiſcum anomalias magnas Cohærentiæ, tum aliquando eam tri-
              <lb/>
            plo majorem in corporibus infixis utrimque foramini obſervaſſet,
              <lb/>
            quam in iis, quæ fulcris libere imponuntur: </s>
            <s xml:id="echoid-s16414" xml:space="preserve">Si Parentiana conſu-
              <lb/>
            lamus Experimenta, tum corpora, foraminibus excepta, non du-
              <lb/>
            plo plus cohærerent, quam quæ fulcris innituntur, nam Lignum
              <lb/>
            Quercicum libere fulcris impoſitum, ruptum fuit in medio a libris 34 {1/2}.
              <lb/>
            </s>
            <s xml:id="echoid-s16415" xml:space="preserve">ſed parallelopipedum alterum priori æquale & </s>
            <s xml:id="echoid-s16416" xml:space="preserve">ſimile, utrimque fora-
              <lb/>
            minibus infixum, geſſit modo libras 51, quod procul abeſt a li-
              <lb/>
            bris 65, quas-ſecundum regulam Mariotti geſtare debuiſſet; </s>
            <s xml:id="echoid-s16417" xml:space="preserve">ſed
              <lb/>
            univerſalis regula tradi hic nequit, uti Experimenta noſtra evice-
              <lb/>
            runt, cum aliquando duplo, triplove major Cohærentia regnet in
              <lb/>
            corporibus a foraminibus exceptis, imo proportiones intermediæ
              <lb/>
            etiam dentur variæ.</s>
            <s xml:id="echoid-s16418" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s16419" xml:space="preserve">Quare autem Cohærentia corporum in hoc Capite tanto major eſt,
              <lb/>
            quam quæ libere fulcris imponebantur? </s>
            <s xml:id="echoid-s16420" xml:space="preserve">mihi hæc ratio eſſe videtur:
              <lb/>
            </s>
            <s xml:id="echoid-s16421" xml:space="preserve">Quando Lignum libere imponitur fulcris, ipſiuſque medio pondera ap-
              <lb/>
            penduntur, deorſum in flectitur quam plurimum, quod multo minus
              <lb/>
            fit corpore foraminibus immiſſo: </s>
            <s xml:id="echoid-s16422" xml:space="preserve">poſito ligno ſuper duobus fulcris & </s>
            <s xml:id="echoid-s16423" xml:space="preserve">
              <lb/>
            magnâ ſimul inflexione, partes inferiores ligni plurimum incurvatæ,
              <lb/>
            â ſe mutuo divelluntur, & </s>
            <s xml:id="echoid-s16424" xml:space="preserve">quaſi ex ſeſe extrahuntur, plus autem ex-
              <lb/>
            trahuntur exteriores quam interiores fibræ, unde harum reſiſtentia eſt
              <lb/>
            minor, fractiſque exterioribus, ſequuntur facile aliæ: </s>
            <s xml:id="echoid-s16425" xml:space="preserve">Verum, ligno
              <lb/>
            immiſſo duobus foraminibus, flexio non magna fit, ideo partes ex
              <lb/>
            ſe mutuo non extrahuntur, ſed omnes, quæ digitatim ſibi impli-
              <lb/>
            citæ erant, ſimul ſolvi debent, & </s>
            <s xml:id="echoid-s16426" xml:space="preserve">quaſi abradi, antequam ab ap-
              <lb/>
            penſo pondere lignum rumpatur, unde longe plus virium </s>
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