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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tum æque magnam attrahendi vim exerciturum Magnetem in alium,
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ac ſi ambo ſibi libere abſque ullo obſtaculo, in æquali diſtantia ob-
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verſi fuiſſent: </
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">Si vero eandem vim attrahendi habeat uterque poſi-
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to intermedio quolibet obſtaculo, vel nullo, non dabuntur Efflu-
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via, ſed ab alia cauſa Magnetum effectus pendebunt; </
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<
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Experimenta accedamus & </
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">exploremus, utrum corpora ſolidiſſima
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inter binos Magnetes poſita, vires attrahentes tollant, imminuant,
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mutent, an eas integras relinquant.</
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<
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">1. </
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">infra quem
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ad diſtantiam 1 {9/12} pollicis poſita Terrella NO fuit, atque explorata
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quantitas virium attrahentium: </
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<
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">deinde inter utrumque Magnetem
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interpoſita eſt moles plumbea, admodum lata, ſed craſſitiei 1 {9/12} pol-
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licis, vires autem attrahentes Magnetum permanſerunt eædem ac
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ante, interpolatis vicibus remotum eſt plumbum, atque denuo in-
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terpoſitum, manente ſemper Attractione omnino eadem.</
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<
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tiei quoque 1 {9/12} pollic: </
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">quo inter eoſdem Magnetes interpoſito, nul-
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lum virium decrementum, incrementum, aut differentia obſervata
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fuit: </
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">plurimi orbes ſtannei, majorem craſſitiem facientes non mu-
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tare potuerunt, vel tantillum vires attrahentes, ſed eas reliquerunt
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eaſdem ac ſi in vacuo ſe liberrime reſpexiſſent Magnetes.</
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intermedia, nihil quoque mutationis Attractioni induxit, ſive adeſ-
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ſet ſive abeſſet.</
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differentiæ viribus attractricibus attulerunt.</
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que impedimento vires Magneticas tranſmiſiſſet, parallelopipedum
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electum fuit Plumbeum, unum pedem craſſum, & </
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gnes, quam qui prioribus Experimentis inſerviit, in menſa fuit po-
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ſitus, ut alterum H, ſuſpenſum ex fune majoribus deprimeret viri-
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bus, nihilominus obſervabatur eadem vis attrahens tam ſepoſito
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quam applicato Magneti Plumbo.</
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