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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INTRODUCTIO AD COHÆRENTIAM
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abludunt ab Experimentis, aliquando calculus majorem indicat fo-
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re Cohærentiam quam fuit obſervata; </
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<
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dat: </
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<
s
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">arbitror hoc evenire, quia Metallum non eſt adeo homoge-
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neum, quam nudo viſui apparet, ſed conſtat hinc inde partibus
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magis minusve cohærentibus, vel quoniam hinc inde plus Sulphu-
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ris, Salis, aut Mercurii poſitum eſt, quod impedit quominus
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æquabilis firmitas detur; </
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<
s
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">adeoque ex hiſce Experimentis diſcimus,
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Cohærentiam Cupri non ſequi accurate craſſitiem, unde ſi de-
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ſideretur Machina quæcunque ex hoc Metallo, ex qua data
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gravitas eſt ſuſpendenda, craſſius ſumendum erit Metallum, quam
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calculus indicaret. </
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<
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<
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ret ex filo Cupreo, ope calculi determinaretur fili craſſities, quæ
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eſſet proxime æqualis 34 lineis cylindricis, ſed obſervata Cohæ-
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rentiæ inæqualitate filum craſſius ſumendum eſſet, quod ſi foret
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40 linearum cylindricarum, tuto pondus datum abſque rupturæ me-
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tu geſtaret.</
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<
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">Ex comparatis tamen aliorum Metallorum Cohærentiis videtur
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colligendum, potius attendendum eſſe ad craſſitiem filorum ante
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inſtitutum Experimentum, quam ad eam poſtea relictam, quia
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proportiones eventuum propius ad illas craſſities appropinquant,
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quam ad has.</
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">EXPERIMENTUM LII.</
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">Filum craſſitiei A ex Orichalco, ſive Cupro Calaminari ab ap-
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penſis lente & </
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pebatur fuit plurimum elongatum & </
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nuerit diametrum 0, 08 pollicis, ſuperficies fracturæ fuit admodum
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aſpera & </
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quidem in conum, ſed vix viſibilem.</
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tequam frangebatur, valde elongatum fuit, unde fracturâ factâ erat
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modo craſſities 0, 07 pollicis in diametro; </
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