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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              <pb o="335" file="0349" n="349" rhead="DE SPECULIS VITREIS."/>
            culo inſerviret, ſi alterutra ſuperficies Mercurio obduceretur, al-
              <lb/>
            titudinis 9 {4/10} pollic. </s>
            <s xml:id="echoid-s8199" xml:space="preserve">latitudinis 8 pollic. </s>
            <s xml:id="echoid-s8200" xml:space="preserve">FCD, mundum & </s>
            <s xml:id="echoid-s8201" xml:space="preserve">ſicciſ-
              <lb/>
            ſimum, impoſitum fuit perpendiculariter aquæ pluviæ, puriſſimæ
              <lb/>
            ADGB hæc adſcendit utrimque ad ſuperficiem Vitri, æque alte,
              <lb/>
            curvam quandam ſuperficiem C G, c g, formans, cujus altitudo
              <lb/>
            C D perpendicularis ſupra Aquam A B erat circiter æqualis {3/30} polli-
              <lb/>
            cis, circiter dico, quoniam tam accurate menſurare non potui ac
              <lb/>
            deſiderabam, cujus longitudo DG etiam circiter æqualis {5/30} pollic.
              <lb/>
            </s>
            <s xml:id="echoid-s8202" xml:space="preserve">erat.</s>
            <s xml:id="echoid-s8203" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s8204" xml:space="preserve">Ut attractio aquæ ad hoc Vitrum intelligatur clarius, ſit KLMO
              <lb/>
            Vitrum, & </s>
            <s xml:id="echoid-s8205" xml:space="preserve">particula quædam Aquæ X, tam parum remota, ut
              <lb/>
            agere in vitrum & </s>
            <s xml:id="echoid-s8206" xml:space="preserve">ab eo attrahi poſſit; </s>
            <s xml:id="echoid-s8207" xml:space="preserve">attrahetur igitur X a pun-
              <lb/>
            cto M in perpendiculari X M, & </s>
            <s xml:id="echoid-s8208" xml:space="preserve">Quia præter punctum M agit ma-
              <lb/>
            gna ſuperficies vitri, quæ exporrecta concipiatur uſque ad M L,
              <lb/>
            M O, etiam trahetur particula X. </s>
            <s xml:id="echoid-s8209" xml:space="preserve">ſecundum L X, ac O X, a
              <lb/>
            punctis L, O, atque ita a puncto quolibet intermedio inter L M
              <lb/>
            & </s>
            <s xml:id="echoid-s8210" xml:space="preserve">O M; </s>
            <s xml:id="echoid-s8211" xml:space="preserve">poſitis autem his punctis æque diſtantibus ab M, erit vis
              <lb/>
            attrahens æqualis quamobrem ſi centro M, radio quolibet ab M verſus
              <lb/>
            L tendente deſcribantur circuli ſupra ſuperficiem vitri, horum integræ
              <lb/>
            peripheriæ æquali vi attrahente in quolibet puncto pollebunt; </s>
            <s xml:id="echoid-s8212" xml:space="preserve">actio
              <lb/>
            autem harum omnium erit verſus M, quamobrem particula X fere-
              <lb/>
            tur in rectâ X M uſque ad M perpendiculari ſupra K O: </s>
            <s xml:id="echoid-s8213" xml:space="preserve">Si X nunc
              <lb/>
            fuerit gutta Aquæ, compoſita ex pluribus particulis, hæc etiam tra-
              <lb/>
            hetur, & </s>
            <s xml:id="echoid-s8214" xml:space="preserve">movebitur ſecundum rectam M X uſque ad contactum
              <lb/>
            M, tum vero partes laterales trahentur verſus L & </s>
            <s xml:id="echoid-s8215" xml:space="preserve">O, adeoque
              <lb/>
            explicabitur gutta quaquaverſum, eundo per varios ſibi concentri-
              <lb/>
            cos circulos, ſi ſua vis attrahens ſuperetur a vi attrahente vitri,
              <lb/>
            adeoque hac attractione agitur gutta haud aliter, ac ſi a ſui parte
              <lb/>
            poſtica ab alio plano premeretur, qua preſſione etiam explicaretur
              <lb/>
            & </s>
            <s xml:id="echoid-s8216" xml:space="preserve">applanaretur.</s>
            <s xml:id="echoid-s8217" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s8218" xml:space="preserve">Quia autem attractio puncti Mjuvatur ab attractionibus omnium
              <lb/>
            punctorum inter M L & </s>
            <s xml:id="echoid-s8219" xml:space="preserve">M O intermediorum, illæ attractiones
              <lb/>
            quæ ſunt proximæ puncto M, juvantur ab aliis remotis, ſed a pau-
              <lb/>
            cioribus, & </s>
            <s xml:id="echoid-s8220" xml:space="preserve">quæ plus diſtant a puncto M, iterum a paucioribus ma-
              <lb/>
            gis adhuc remotis, ſequitur vires attrahentes in puncto M eſſe ma-
              <lb/>
            ximas, omnium vero aliorum punctorum S, V, Q, P, L, </s>
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