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-s5361" xml:space="preserve">
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            tempore 60?</s>
            <s xml:id="echoid-s5362" xml:space="preserve">. hujus quadratum eſt 3600, adeoque ſunt 10260 ad 31570, veluti 3600 ad 11135 {115/171}, hujus numeri radix eſt media in- ter 105 & </s>
            <s xml:id="echoid-s5363" xml:space="preserve">106 ſed tempus 10 vibrationum fuit obſervatum 106?</s>
            <s xml:id="echoid-s5364" xml:space="preserve">. quod ſatis accurate congruit; </s>
            <s xml:id="echoid-s5365" xml:space="preserve">non enim hæc proportio ſemper lo- cum habebit, cum tantopere tempora vibrationum inter ſe diffe- rant, ſufficit ad veritatem appropinquaſſe. </s>
            <s xml:id="echoid-s5366" xml:space="preserve">Quando hæc experi- menta inſtituuntur, ſollicite curandum eſt ut ſtylus, ſupra quem Acus vertitur, ſit acutus politiſſimuſque ſimul, & </s>
            <s xml:id="echoid-s5367" xml:space="preserve">cavitates Acuum etiam lævigatiſſimæ. </s>
            <s xml:id="echoid-s5368" xml:space="preserve">cæteroquin aſperitates motum vibratorium impediunt, atque tempus excurrit longius, quo vibratio abſolvi- tur, quam fieret poſitis omnibus lævigatiſſimis: </s>
            <s xml:id="echoid-s5369" xml:space="preserve">Cum elapſis qui- buſdam menſibus experimenta eadem repetierim, aliud tempus ex- currere, quo eædem vibrationes abſolvebantur, animadverti: </s>
            <s xml:id="echoid-s5370" xml:space="preserve">præ- terea novam longiſſimamque præparavi Acum, 36 {1/2} pollic. </s>
            <s xml:id="echoid-s5371" xml:space="preserve">Rheno- land. </s>
            <s xml:id="echoid-s5372" xml:space="preserve">fere ubivis ejuſdem craſſitiei, cujus pondus erat 1233 grano- rum, cujus tempora in repetitis tentaminibus fuerunt fere eadem, diſcrepantia tamen parum inter ſe, quorum unum hic adferam.</s>
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          Vibrationes Tempora # M?. # M?.
            <lb/>
          1 # 0 # 18
            <lb/>
          2 # 0 # 38
            <lb/>
          3 # 0 # 56
            <lb/>
          4 # 1 # 15
            <lb/>
          5 # 1 # 33
            <lb/>
          6 # 1 # 49
            <lb/>
          7 # 2 # 11
            <lb/>
          8 # 2 # 24
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            <s xml:id="echoid-s5374" xml:space="preserve">Tempus medium, quo una vibratio abſolvitur, eſt proinde æqua-
              <lb/>
            lis 18 {1/2} minuto ſecundo: </s>
            <s xml:id="echoid-s5375" xml:space="preserve">ſi nunc comparemus tempus vibrationis
              <lb/>
            impenſum ab hac Acu, cum tempore a pendulo acto gravitate & </s>
            <s xml:id="echoid-s5376" xml:space="preserve">
              <lb/>
            ejuſdem longitudinis, quod foret 34 circiter minutorum tertiorum,
              <lb/>
            erunt hæc tempora inter ſe uti 18 {1/2} Minuta ſecunda ad 34 Minuta
              <lb/>
            tertia ſive uti 1110 ad 34 quamobrem per ea Lemmata de pendulis
              <lb/>
            ſupra aſſumta, erit vis gravitatis ad vim directricem Magnetis, </s>
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