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-s16889" xml:space="preserve">
              <pb o="664" file="0680" n="681" rhead="INTRODUCTIO AD COHÆRENTIAM"/>
            & </s>
            <s xml:id="echoid-s16890" xml:space="preserve">ſimul Tubus F G productus fuit ad longitudinem 100 pedum: </s>
            <s xml:id="echoid-s16891" xml:space="preserve">In
              <lb/>
            quo apparatu aquâ penitus repleto, tandem a parte inferiori fiſ-
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            ſura oriebatur ab S verſus R, quæ tranſverſe deinde ſerpebat ab R
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            verſus T, ferrumine interim partes bene tenente; </s>
            <s xml:id="echoid-s16892" xml:space="preserve">manſerat vero
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            apparatus integer tubo tantum ad 80 & </s>
            <s xml:id="echoid-s16893" xml:space="preserve">90 pedes uſque aquâ re-
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            pleto.</s>
            <s xml:id="echoid-s16894" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s16895" xml:space="preserve">Ita quidem firmitatem ferri demonſtravit Mariottus, utinam ad-
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            didiſſet cujuſnam craſſitiei fuiſſet, nam omne ferrum ſtanno obdu-
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            ctum non eſt æque craſſum: </s>
            <s xml:id="echoid-s16896" xml:space="preserve">quia autem aquæ ductibus potius in-
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            ſerviunt tubi plumbei, Experimenta cum hiſce capta erunt majoris
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            utilitatis.</s>
            <s xml:id="echoid-s16897" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s16898" xml:space="preserve">Confectum fuit Tympanum plumbeum, cujus diameter in me-
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            dio erat 1 pedis, altitudo 18 pollic. </s>
            <s xml:id="echoid-s16899" xml:space="preserve">ambo extrema ad ſe appropin-
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            quabant, ut modo diametrum 8 pollicum habuerint, quæ inſiſtebant
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            laminæ plumbeæ planæ: </s>
            <s xml:id="echoid-s16900" xml:space="preserve">ex medio ſuperioris exſurgebat tubus
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            plumbeus 100 pedes altus, omnis hic apparatus ferrumine conjun-
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            gebatur ſecum invicem, ferrumen latitudinem unius pollicis occu-
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            pabat, & </s>
            <s xml:id="echoid-s16901" xml:space="preserve">altitudinem 8 linearum: </s>
            <s xml:id="echoid-s16902" xml:space="preserve">craſſities plumbi componentis
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            Tympanum ejuſque baſis erat 2 {1/2} linearum: </s>
            <s xml:id="echoid-s16903" xml:space="preserve">apparatus hic impletus
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            aqua uſque ad 100 pedes manſit integer, baſi tamen ſuperiori & </s>
            <s xml:id="echoid-s16904" xml:space="preserve">
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            inferiori ſe incurvante ad altitudinem {1/2} pollicis; </s>
            <s xml:id="echoid-s16905" xml:space="preserve">tum medium
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            Tympani lima abraſum fuit ad altitudinem circiter 6 pollicum & </s>
            <s xml:id="echoid-s16906" xml:space="preserve">
              <lb/>
            ad latitudinem 4 pollicum, craſſitie plumbi reducta ad 1 lineam,
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            vel paulo minus, oriebatur inflatio, findebatur plumbum ad lon-
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            gitudinem 3 pollicum, omni effluente per fiſſuram aqua: </s>
            <s xml:id="echoid-s16907" xml:space="preserve">adeoque
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            plumbum craſſitiei 2 {1/2} linearum firmitate ſuâ pluſquam ſufficit ad
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            preſſionem aquæ 100 pedes altæ perferendam in tubo diametri 1
              <lb/>
            pedis, hinc tuto ponitur craſſities {2/10} pollicis ſufficientis firmitatis.
              <lb/>
            </s>
            <s xml:id="echoid-s16908" xml:space="preserve">Romerus memorat in Experimento Verſalleano Tubum plumbeum
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            diametri 16 pollicum, craſſitiei 6 {1/3} linearum, altitudinis 50 pedum
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            ſufficientem firmitatem habuiſſe ad aquæ preſſioni reſiſtendum,
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            quod mirum non eſt, nam ſecundum Experimentum Mariotti mo-
              <lb/>
            do allatum, craſſities 3 {1/3} linearum ſufficeret, imo minor adhuc: </s>
            <s xml:id="echoid-s16909" xml:space="preserve">
              <lb/>
            Ex his Experimentis poterimus craſſities tuborum plumbeorum
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            facile determinare, ut habeant datam firmitatem, reſiſtantque
              <lb/>
            preſſionibus aquæ in data altitudine, nam demonſtratum eſt in </s>
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