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

Table of Notes

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            <s xml:id="echoid-s12879" xml:space="preserve">
              <pb o="546" file="0562" n="563" rhead="INTRODUCTIO AD COHÆRENTIAM"/>
            ribus perfecte rigidis datur proportio duplicata, quæ etiam a priori
              <lb/>
            Geometrice demonſtrari poteſt, de Flexibilibus omnibus nondum de-
              <lb/>
            monſtrari potuit, latet profecto in fibrarum lentitiâ adhuc aliquid,
              <lb/>
            quod perſpicientiam efſugit, atque Philoſophorum ſagacitatem eluſit.</s>
            <s xml:id="echoid-s12880" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s12881" xml:space="preserve">Quoniam Vitrum inter corpora maxime homogenea merito poni-
              <lb/>
            tur, ratus fui cum eo inſtituta Experimenta regulam accurate ex-
              <lb/>
            hibitura, quæ revera ita prodiit; </s>
            <s xml:id="echoid-s12882" xml:space="preserve">monere oportet, difficillime cum
              <lb/>
            Vitro Experimenta accurata capi poſſe, quia Vitrum facilius vel dif-
              <lb/>
            ficilius frangitur pro duritie vel mollitie diverſa oræ foraminis, ex
              <lb/>
            quo eminet; </s>
            <s xml:id="echoid-s12883" xml:space="preserve">ſi ora cuprea vel ferrea ſit, tum idem Vitrum frange-
              <lb/>
            tur a libris 4 appenſis, quod ab 8 libris modo frangitur, ſi ora
              <lb/>
            fuerit lignea, vel plumbo aut Stanno obducta, cujus rei rationem fru-
              <lb/>
            ſtra ex Mechanicâ quæſiveris: </s>
            <s xml:id="echoid-s12884" xml:space="preserve">poſt varios igitur incaſſum tentatos
              <lb/>
            labores; </s>
            <s xml:id="echoid-s12885" xml:space="preserve">hanc methodum eſſe optimam Experientia docuit.</s>
            <s xml:id="echoid-s12886" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s12887" xml:space="preserve">Ex vitreo ſpeculo, utrimque lævigato, & </s>
            <s xml:id="echoid-s12888" xml:space="preserve">per totam magnitudi,
              <lb/>
            nem æque craſſo exſectæ ſunt lamellæ, rectangulæ, diverſarum
              <lb/>
            latitudinum: </s>
            <s xml:id="echoid-s12889" xml:space="preserve">harum Sectiones, quæ inæquales ſemper ſunt ab ada-
              <lb/>
            mante fiſſæ, lævigatæ fuerunt & </s>
            <s xml:id="echoid-s12890" xml:space="preserve">rectangulæ factæ, ita ut quælibet
              <lb/>
            lamella fuerit parallelopipedum rectangulum ab omni parte: </s>
            <s xml:id="echoid-s12891" xml:space="preserve">Tum
              <lb/>
            in majori mole Ligni Buxini inciſura facta fuit, ejus amplitudinis,
              <lb/>
            ut accurate craſſitiem laminæ caperet, inciſuræ baſis planiſſima fuit
              <lb/>
            facta, & </s>
            <s xml:id="echoid-s12892" xml:space="preserve">Lignum ita affixum Tabulæ, ut hæc baſis quoque fuerit
              <lb/>
            accuratiſſime horizontalis, niſi enim id fiat, nunquam confidi
              <lb/>
            poſſet Experimento; </s>
            <s xml:id="echoid-s12893" xml:space="preserve">tum ex ligno eodem aſſerculus inciſuræ con-
              <lb/>
            gruens etiam factus qui minus magiſque profunde ipſi immitti poſſet,
              <lb/>
            & </s>
            <s xml:id="echoid-s12894" xml:space="preserve">ſuperius ope binarum cochlearum retineri: </s>
            <s xml:id="echoid-s12895" xml:space="preserve">baſi inciſuræ impoſita
              <lb/>
            fuit tenuis lamella ſtanni, circiter o, 03 pollicis craſſa, quæ impe-
              <lb/>
            diebat, quominus ora anterior ligni a vitro læderetur: </s>
            <s xml:id="echoid-s12896" xml:space="preserve">huic inci-
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            ſuræ immiſſæ fuerunt vitreæ lamellæ, cujus ſuperior ſuperficies,
              <lb/>
            adacto ligneo aſſerculo, horizonti erat parallela, atque aliud latus
              <lb/>
            ipſi perpendiculare; </s>
            <s xml:id="echoid-s12897" xml:space="preserve">erat omnium craſſities 0, 16 pollicis, diſtantia
              <lb/>
            applicati ponderis a foramine fuit accurate 3 pollicum Rhenolandi-
              <lb/>
            corum in primis tribus Experimentis, in tribus ſequentibus fuit 2
              <lb/>
            pollicum.</s>
            <s xml:id="echoid-s12898" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s12899" xml:space="preserve">Præterea ſollicite admodum curandum eſt, ut hæc tentamina ca-
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            piantur in loco quietiſſimo; </s>
            <s xml:id="echoid-s12900" xml:space="preserve">ſi enim ambulaveris, aut currus per </s>
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