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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        <div xml:id="echoid-div187" type="section" level="1" n="187">
          <pb o="283" file="0297" n="297" rhead="DE TUBIS CAPILLARIBUS VITREIS."/>
        </div>
        <div xml:id="echoid-div188" type="section" level="1" n="188">
          <head xml:id="echoid-head200" xml:space="preserve">EXPERIMENTUM XII.</head>
          <p>
            <s xml:id="echoid-s6745" xml:space="preserve">Tubi ejuſdem impleti Aquâ ad altitudinem 20 linearum, po-
              <lb/>
            ſitique perpendiculariter in aëre, orificium ſupremum hermeti-
              <lb/>
            ce fuit clauſum ope flammæ, aqua interim manente immota & </s>
            <s xml:id="echoid-s6746" xml:space="preserve">
              <lb/>
            ad eandem altitudinem: </s>
            <s xml:id="echoid-s6747" xml:space="preserve">obturaculo deinde diffracto, man-
              <lb/>
            ſit Aqua immota ut ante. </s>
            <s xml:id="echoid-s6748" xml:space="preserve">Quamobrem occluſio nihil mutatio-
              <lb/>
            nis adfert ad Aquam ſuſpenſam tenendam.</s>
            <s xml:id="echoid-s6749" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div189" type="section" level="1" n="189">
          <head xml:id="echoid-head201" xml:space="preserve">EXPERIMENTUM XIII.</head>
          <p>
            <s xml:id="echoid-s6750" xml:space="preserve">Eundem Tubum Aquâ vacuum, ſuperius abruptum iterum hermetice
              <lb/>
            clauſi, omnibuſque refrigeratis, orificium apertum impoſui Aquæ, cu-
              <lb/>
            jus nulla guttula tubum ingreſſa fuit: </s>
            <s xml:id="echoid-s6751" xml:space="preserve">ſubmerſo deinde tubo ad
              <lb/>
            altitudinem unius pollicis infra Aquam, aliquid, quod tamen
              <lb/>
            vix conſpici poterat, in tubum intravit.</s>
            <s xml:id="echoid-s6752" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6753" xml:space="preserve">Aqua in hoc Experimento tubum ingredi non poterat, quin
              <lb/>
            condenſaret aërem, cujus vis elaſtica augetur in ratione denſita-
              <lb/>
            tis auctæ ſive inverſa ſpatiorum; </s>
            <s xml:id="echoid-s6754" xml:space="preserve">ideo ſi tubi vis elevans ſepona-
              <lb/>
            tur, facile cognoſci poteſt quouſque Aqua in ipſum aſſurgere de-
              <lb/>
            buiſſet, preſſa â gravitate unius pollicis Aquei: </s>
            <s xml:id="echoid-s6755" xml:space="preserve">Quo tempore ex-
              <lb/>
            perimentum inſtituebatur, erat Mercurius in Baroſcopio elevatus
              <lb/>
            ad 29 pollicum altitudinem, ſive ad 406 pollices Aquæ: </s>
            <s xml:id="echoid-s6756" xml:space="preserve">poſi-
              <lb/>
            ta hujus gravitate ad eam Mercurii uti 1 ad 14. </s>
            <s xml:id="echoid-s6757" xml:space="preserve">quamobrem aër,
              <lb/>
            qui erat in tubo comprimebatur viribus 406 pollicum Aquæ, ſed
              <lb/>
            tubo ſubmerſo profundius quantitate 1 pollicis, Aër in ipſo com-
              <lb/>
            primebatur vi 407 pollicum hinc denſior reddebatur, adeoque
              <lb/>
            ſpatium ab Aëre prius occupatum, debebat eſſe ad ſpatium ab eo
              <lb/>
            nunc occupatum, uti 407 ad 406, & </s>
            <s xml:id="echoid-s6758" xml:space="preserve">quia tubus erat longitudinis
              <lb/>
            3 {1/2} ſive 3 {407/814} pollicum, quod erat ſpatium prius ab aëre impletum,
              <lb/>
            nunc debebat eſſe ſpatium ejus 3 {400/814} pollic. </s>
            <s xml:id="echoid-s6759" xml:space="preserve">quæ differentia profecto
              <lb/>
            inſenſibilis eſt: </s>
            <s xml:id="echoid-s6760" xml:space="preserve">addamus nunc vim elevantem Aquæ, quæ in Ex-
              <lb/>
            perimento I deprehenſa fuit æqualis 20 lineis Aquæ, erit igitur
              <lb/>
            tota vis aërem condenſatura, compoſita ex 20 lineis + 1 pollice Aquæ,
              <lb/>
            hinc aër in tubo occupabit ſpatium 3 {388/814} pollic. </s>
            <s xml:id="echoid-s6761" xml:space="preserve">proximè, ſive </s>
          </p>
        </div>
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    </echo>
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