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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CORPORUM FIRMORUM.
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tamen reſoluta contorſione, quemlibet funem vires librar. </
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<
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dere; </
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<
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xml:space
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">Quamobrem confirmamur iterum funes compoſitos ex aliis,
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per contorſionem debilitari; </
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<
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">atque vires determinari poſſe ope
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Trianguli formati ex perpendicularibus in directionem ſpiræ, reſi-
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ſtentiæ, & </
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">Sed Reaumuriana obſervata anne-
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ctere libet, ut multitudine Experimentorum â variis captorum Phi-
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loſophis magis convincamur, & </
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<
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">eo citius præjudicatam opinionem
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exuamus: </
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72, hic erat compoſitus ex tribus funiculis, evolvit funem, ut ho-
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rum trium robur ſeorſim examinaret; </
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<
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27 ferre, alter libras 33. </
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eſt librar. </
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geſtaverunt: </
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libras 70, nam a libris 72 frangebatur; </
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los ipſum componentes, quorum unus ferebat libras 24, alter 28,
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tertius 30; </
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">ſumma horum ponderum eſt æqualis libris 82, quæ ma-
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jor eſt, quam a fune compoſito lata fuit: </
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xml:space
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">Si hæc Reaumuriana no-
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ſtraque Experimenta non plane evicerint quemcunque funem com-
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poſitum ex aliis debilitari convolutione in ſe mutuo, dubito an
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quidem unquam aliquid demonſtratum fuerit: </
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<
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">prolixior evaſi quam
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par erat, ſed ad errorem receptum eliminandum, ſemper quamplu-
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rimum laboris impendi debet. </
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<
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nullorum funium datæ craſſitiei, ut a priori cognoſcamus, quoties-
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cunque aliquod pondus elevandum, vel grave onus movendum ſit,
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cujus craſſitiei funis deſideretur, qui pondus geſtare valeat.</
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<
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">Componuntur a reſtiariis funes tum albi, tum cinerei coloris,
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quorum unum genus ex Cannabe inſolatione albefacta, alterum ex
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Cannabe vulgari conficitur, utrumque genus examinavi, atque even-
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tus tentaminum hi fuerunt.</
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">Funis inſolatione candeſactus, cujus circumferentia erat 0, 15
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pollicis, compoſitus ex tribus funiculis in unum contortis, qui
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ſinguli ex pluribus filamentis etiam contortis conſtabant, fuſtinuit
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libras 31, ſed a libris 32 fractus fuit.</
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