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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cujus quodlibet latus o, 25 pollicis, a libris 600 appenſis non dif-
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fractum fuit, ſed ſpecies parallelopipedi extrahebatur ex
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medio capitis craſſioris, quod findebatur.</
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latus fuit 0, 25 pollicis, hoc penitus diffractum fuit a libris 800 in
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oblongam abeundo feſtucam, pictam in Tab. </
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<
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">Sunt hæc omnia Experimenta, quæ cum Lignis diverſis inſti-
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tui, eodem modo explorari poſſunt reliqua omnia, ſi abſoluta re-
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ſiſtentia eorum deſideratur: </
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">Fuerunt hæc capta ſatis ſollicite, non
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tamen dubito, quin ſi repetantur, aliquando diverſiſſimum eventum
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exhibitura ſint: </
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">nam prout Lignum in ſolo magis minusve aquoſo,
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paludoſo, oleoſo, ſalſo concreverit, eo plus minusve tenax erit:
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">prout in regione calidiori frigidiorive plantatum fuerit, eo etiam
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plus minusve cohærebit: </
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">prout annoſior truncus, teneriorve ramus
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fuerit, ex quo præparatur id, quod experimento inſerviet, eo rigi-
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dius flexiliusve erit Lignum, ſive fortius debiliusve: </
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Lignum fibris quam rectiſſimis, aut flexuoſis concretum, iterum
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Cohærentia diverſa obſervabitur: </
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">Ut Metallorum firmitatem explorarem, confici ex iis curavi fi-
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la cylindrica, ex quolibet Metallo quatuor, quorum diver-
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ſa erat craſſities, ut non modo detegerem Cohærentiam Metalli
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ſub craſſitie illius fili, ſed ſimul cognoſcerem an Metallorum firmi-
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tas in ratione craſſitierum foret, an filum nempe duplo craſſius al-
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tero, ex eodem præparatum Metallo, duplo majori firmitate </
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