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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dum eſt ſolidis, cui nemo adſtipulabitur; </
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<
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xml:space
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tum fuerit vel non, eadem manet actio Ferri in Magnetem; </
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niſi aliquid abſurdiſſimum ſupponatur, fluidum ejuſmodi fingi ne-
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quit.</
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</
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<
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<
s
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xml:space
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">Sed ulterius hæc hypotheſis fluidi alicujus externi, vel effluvio-
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rum Magneticorum enecanda erit, quod ope ſequentium experi-
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mentorum ſatis facile fiet.</
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<
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">Magnes & </
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<
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xml:space
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">lamella aut virga chalybea vel ferrea ſeorſim accura-
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tiſſime ponderentur, Magneti affricetur lamella aut virga, tumque
<
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iterum amborum pondus ſeorſim exploretur, deprehenditur pon-
<
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dus in utroque corpore manſiſſe idem.</
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<
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</
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<
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<
s
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xml:space
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">Primus hoc Experimentum inſtituit Normannus capiendo 2 vel
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3 fragmenta oblonga fili ferrei, quæ primum in aurificis ſtatera pon-
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deravit; </
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>
<
s
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xml:space
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">tum Magneti affricta iterum ponderavit, idemque man-
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ſiſſe deprehendit pondus vid New. </
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<
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">Gilbertus idem
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fecit Lib. </
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">Merſennus & </
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">Gaſſendus apud Zygoſtatam mo-
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netalem libellâ accuratiſſima pondus explorantes ferri ante & </
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<
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applicationem ad Magnetem, idem manſiſſe notant, vid. </
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<
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xml:space
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dusin Lib. </
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<
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<
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<
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</
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<
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xml:space
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">Verum Whiſtonus hoc obſervatum dubium reddidit in Tractatu of
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The dipping needle pag. </
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<
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<
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">leviusque fieri affirmat Ferrum poſtquam
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Magneti applicatum fuit; </
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<
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xml:space
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">ſumſit enim virgam 4 pedes longam pon-
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deris 4015 {3/8} granorum antequam Magnetem olfecerat, poſt appli-
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cationem pondus decreverat 2 granis: </
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<
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xml:space
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">aliam ſumſit 4584 {1/8} granorum,
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cujus pondus poſt applicationem ad Magnetem decrevit 2 {1/8} granis: </
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aliam ſumſit 14792 {1/2} granorum, cujus pondus decrevit 2 {1/2} granis. </
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Aliam adhibuit 65726 granorum, cujus pondus decrevit 14 granis,
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teſtemque Experimentorum advocat Hauksbejum. </
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piebar ſimilia repetendi Experimenta ſumma cum cura, Libram ac-
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curatiſſimam adhibui, quæ etiamſi magna ſatis ſit, nihilominus
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{1/20}grani parte movebatur, onerata pondereLibrarum 2. </
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cujus pondus explorarem, aliquid ageret in ipſam Libram, id ex filo
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æneo longo 5 pedes ſuſpendi: </
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ejus margines circumflexi in ſe filum ferreum continent, ita </
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