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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Vitrum enim ponatur ante oculos, quod inter rigidiſſima huc uſque
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cognita numeratur; </
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<
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">id nihilominus in fila ductum tenuia, valde
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quam flexile obſervatur, uti plumæ ex eo confectæ, tum Tubi ca-
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pillares probant, quorum aliquem, 3 pedes longum, in circulum
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flectere potui integrum: </
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<
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">idcirco antequam vitrum frangitur, par-
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tes aliquomodo ex ſe extricantur, ſucceſſive rumpuntur. </
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<
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multo clarius videtur in ligno transverſe frangendo: </
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<
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aliquod, uti in Tab. </
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<
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">A B K C, cujus latus A B parieti
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D B H A E applicatum firmiter, aut infixum ſit, quod a potentia vel
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pondere Q deorſum trahatur; </
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">hoc antequam frangetur, incurvabitur,
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partes ſupremæ 1 B 2 B extrahentur ex ſe ad notabilem uſque diſtan-
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tiam, deinde â ſe fatiſcent, cohærentibus tum nihilominus parti-
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bus 1 H 2 H, quæ tantundem ac ſuperiores extrahendæ ſunt ante-
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quam ſolvantur, ſequuntur tum aliæ propiores ipſi A, quæ minus
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adhuc extricatæ, magis extrahendæ ſunt, priuſquam ſeſe relin-
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quant, adeoque ſucceſſive fiet partium ſolutio, primo ſuperiorum,
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tum mediarum, tandem inferiorum: </
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rum & </
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">ſucceſſiva abruptio demonſtrant, Galilæi hypotheſin non cum
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Experimentis, quæ cum corporibus naturalibus inſtituentur, poſſe
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congruere: </
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">Cui accedit, quod fibræ corporum, quæ extrahuntur,
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eo plus reſiſtunt viribus ſeparantibus, quo plus extrahuntur; </
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minus autem reſiſtunt, quo minus extrahuntur; </
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corpore ligneo, modo conſiderato, fibræ ſuperiores 1 B 2 B maxime
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extractæ, maximâ vi ſe retrotrahent, hoc eſt reſiſtent, minus ex-
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tractæ fibræ 1 H 2 H, etiam minori vi ſe retrotrahent, eritque vis
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fibrarum retrotrahens ſemper eo minor, quo fibræ propius puncto
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A fuerint: </
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">Ex quo ſequitur, ab omnibus punctis lateralibus cor-
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poris A 2 H 2 B vim reſiſtentiæ admodum inæ qualem contra poten-
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tiam Q ſeparare nitentem eodem temporis momento exerceri,
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quæ a Galilæo æqualis ſupponebatur: </
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ſervationes evincunt regulam Galilæi non reſponſuram Experimen-
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tis cum corporibus flexilibus inſtituendis, uti etiam eventus com-
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probavit, Mariottus enim nonnulla Cohærentiæ abſolutæ & </
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ctivæ inter ſe comparans Tentamina, obſervavit potentiam corpus
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transverſe ſeparantem eſſe aliquando {1/3}, aliquando {1/4} illius, quæ
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corpus directe fregerat: </
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