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-div194" type="section" level="1" n="194">
          <pb o="295" file="0309" n="309" rhead="DETUBIS CAPILLARIBUS VITREIS."/>
        </div>
        <div xml:id="echoid-div195" type="section" level="1" n="195">
          <head xml:id="echoid-head207" xml:space="preserve">CAPUT SECUNDUM.</head>
          <head xml:id="echoid-head208" style="it" xml:space="preserve">De Tubis æque longis diver ſarum diametrorum.</head>
          <p>
            <s xml:id="echoid-s7000" xml:space="preserve">Ut accuratiſſime menſurarem adſcenſum Aquæ in tubos æque
              <lb/>
            longos diverſarum diametrorum; </s>
            <s xml:id="echoid-s7001" xml:space="preserve">elegi tubos, 5 pollices Rhe-
              <lb/>
            nolandicos longos, intus puriſſimos, qui elapſâ tantum horâ erant
              <lb/>
            confecti, ne impuritas, aërisve ſordes aliquid adferrent impedi-
              <lb/>
            menti erroriſve experimentis: </s>
            <s xml:id="echoid-s7002" xml:space="preserve">magna difficultas latet in eligendis
              <lb/>
            tubis, quorum cavitates ſunt perfecte cylindricæ, his tamen dun-
              <lb/>
            taxat utendum eſt. </s>
            <s xml:id="echoid-s7003" xml:space="preserve">Ut cavitatum diametros exacte menſurarem,
              <lb/>
            ex charta tenui, ſed rigida Triangulum feci, cujus dorſum erat
              <lb/>
            {4/10} pollicis, longitudo 3 pollic. </s>
            <s xml:id="echoid-s7004" xml:space="preserve">quod accurate erat diviſum in par-
              <lb/>
            tes æquales, ita ut {1/100} partem pollicis manifeſto diſtinguere poſſem:
              <lb/>
            </s>
            <s xml:id="echoid-s7005" xml:space="preserve">hæc Charta immiſſa tubis menſurabat utcunque diametros, & </s>
            <s xml:id="echoid-s7006" xml:space="preserve">mon-
              <lb/>
            ſtrabat ſimul, num tubi eſſent ovales, num perfecte cylindrici: </s>
            <s xml:id="echoid-s7007" xml:space="preserve">fa-
              <lb/>
            teor hac methodo non Mathematice menſurari diametros, quia
              <lb/>
            Charta craſſitiem habet, atque inſtar parallelopipedi craſſi exiſtit,
              <lb/>
            quod cylindrico immiſſum tubo, chordam aliquam circularis baſeos
              <lb/>
            metitur, non diametrum, ſed meliorem methodum invenire hacte-
              <lb/>
            nus non potui: </s>
            <s xml:id="echoid-s7008" xml:space="preserve">ope Microſcopii rem tentaveram, pejoriautem cum
              <lb/>
            ſucceſſu: </s>
            <s xml:id="echoid-s7009" xml:space="preserve">Tum vitrum planiſſimæ baſeos quæſitum, diametri 4
              <lb/>
            pollicum, cui parum puræ Aquæ fuit affuſum, ut ne quidem al-
              <lb/>
            titudinem {1/20} pollicis acquireret, niſi hoc obſervetur, altitudines
              <lb/>
            veræ, ad quas in tubos Aqua adſcendit, notari nequeunt, cum A-
              <lb/>
            qua extrinſecus aſſurgens ad latera tuborum conſpectum impediat,
              <lb/>
            & </s>
            <s xml:id="echoid-s7010" xml:space="preserve">ſimul menſuram. </s>
            <s xml:id="echoid-s7011" xml:space="preserve">In hiſce autem & </s>
            <s xml:id="echoid-s7012" xml:space="preserve">ſequentibus uſus fui alia
              <lb/>
            menſura, quam ſupra, cum ſcalam commodiorem tum nactus eram,
              <lb/>
            in qua nempe pollex dividitur in 10 lineas, pollex tamen eſt Rhe-
              <lb/>
            nolandicus, idemque qui ante: </s>
            <s xml:id="echoid-s7013" xml:space="preserve">præterea uſus fui decimalium
              <lb/>
            notatione. </s>
            <s xml:id="echoid-s7014" xml:space="preserve">Experimenta fuerunt ſequentia.</s>
            <s xml:id="echoid-s7015" xml:space="preserve"/>
          </p>
        </div>
      </text>
    </echo>
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