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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jorem regulam abſtuliſſe quidem minorem a Magnete, ſed ambas â
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ſe ſeparatas fuiſſe, poſtquam a Magnete duobus tribuſve pollicibus
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receſſerant.</
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">Cuſpis Acus chalybeæ hebetata fuit, capite manente craſſiori,
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cuſpide applicata Magneti fortiſſimo & </
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">capite virgæ ferreæ, ſemper
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deductæ a Lapide virgæ adhæſit firmiter Acus, a Magnete ademta:
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</
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<
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">capite Acus deinde applicato Magneti, & </
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<
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">cuſpide regulæ ferreæ,
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aliquando avellebatur Acus a Magnete, aliquando non, remotâ ut
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ante regulâ.</
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<
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<
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<
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">Tum cuſpis Acus reddita fuit acutiſſima, & </
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<
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natum, cuſpide applicata Magneti, & </
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<
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">capite virgæ ferreæ, huic
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ſemper Acus adhæſit, tollique â Magnete potuit. </
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<
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applicato Magneti, cuſpide virgæ, nunquam adhæſit virgæ, ſed
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applicata Magneti manſit: </
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<
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">idcirco prima fronte opinabar, cum aliis
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Philoſophis Acum adhærere corpori, quod pluribus attingebat pun-
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ctis, attamen erroneam hanc fuiſſe opinionem plura me docuerunt Ex-
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perimenta, nam clavis, cujus planities magna, appoſita fuit plano Ma-
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gnetis polo, adeo ut contactus in lata ſuperficie daretur, tum caput
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alterius clavis rotundum applicatum fuit capiti rotundo prioris cla-
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vis, ut contactus ambarum in puncto tantum fuerit, nihilo-
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minus clavis ſecunda abſtulit primam a Magnete; </
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perimentum cum Cl. </
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">Hartſoekero, tum affirmante, ſe idem parado-
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xon ſemper obſervaſſe, quod etiam adnotavit de la Hirius in L’Hiſt.
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</
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<
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">ratus, Ferrum eſſe fortiorem
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Magnetem ad attrahendum Ferrum ipſo Lapide, hinc regulam fer-
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ream adimere aliam a Magnete: </
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">Hoc tamen videtur nimis precario
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aſſumtum, cum a Magnete præſtantiſſimo Ferrum vix viribus do-
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natum adimit aliud Ferrum: </
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<
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quomodo Magnes debilior a fortiori abripiat Ferrum in Experimen-
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to XLVII. </
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">Supponit quidem Philoſophus debiliorem Magnetem vi-
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res acquirere a fortiori, ſed demonſtrandum foret debiliorem fieri
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fortiorem ipſo Magnete præſtantiſſimo, quod an concipi concedive
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queat vehementer dubito: </
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