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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DE MAGNETE.
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quiſivit; </
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">poſtea in aliis locis, ſed ſemper accedendo verſus me-
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dium, flexiones inſtituens, auctas vires Magneticas deprehendit;
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<
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">Octo locis ita inſlexis fractura prior tantas nacta erat vires, ut
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4 clavos ferreos elevaverit. </
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dio Ferri uſque ad oppoſitum extremum, atque continuo vim u-
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triuſque extremi examinando, fracturæ virtutem decreviſſe, incre-
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ſcente eodem tempore illa alterius extremi deprehendit, donec poſt
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plurimas flexiones in Ferri variis locis extremum acceperit vim ele-
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vandi 4 clavos, ſuperficie fracturæ tum tantum capaci gerendi li-
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maturæ particulas.</
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">Si Filum ferreum in medio aliquoties flectatur, ejus ambo extre-
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ma non nanciſcuntur vim manifeſtam: </
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<
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">concipiantur a medio Ferri
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verſus utrumque extremum notæ æquali intervallo a ſe diſtantes,
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atque Ferrum inflecti in duabus notis medio æqualiter utrimque re-
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motis, atque ab eo incipiendo; </
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<
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">tum ambo Ferri extrema vim ac-
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quirent, ſed debiliorem, quam ſi omnes flexiones ab una parte me-
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dii factæ fuiſſent, imo tam debilis utriuſque extremitatis vis erit,
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ut non adæquet {1/3} vel {1/4} illius, quam habuiſſet, factis flexionibus ab
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una dimidia parte Ferri.</
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">Si Filum ferreum variis inflexionibus acceperit in alterutro ex-
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tremo vim notabilem attractricem, deinde autem in aliis adhuc lo-
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cis, inter idem extremum & </
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<
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tur, non augebitur vis attractrix ejuſdem extremi, ſed potius de-
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ſtruetur, quemadmodum ſupra annotavi vim fili Magneti affricti & </
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deinde aliquoties inflexi, perire.</
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Ferrum, vario tuſum ope Mallei modo, vim Magneticam </
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