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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<
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xml:space
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">Ambo iidem Magnetes juxta ſe, nihilo interpuncto, ponantur; </
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<
s
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poli alterni nominis ſurſum ſpectent, ſupra aſſerculum, illis impoſitum,
<
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ſpargatur Scobs ferrea, hæc uti in Tab. </
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<
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xml:space
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<
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xml:space
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ſtrabit ad A, a. </
s
>
<
s
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xml:space
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preserve
">inter quos loco intermedio Scobs in curvilineam,
<
lb
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ab utraque parte convexam, figuram diſponetur, cæteroquin qua-
<
lb
/>
quaverſum vis rectà exiens Scobem quoque rectà conformat: </
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>
<
s
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xml:space
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">in-
<
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termedia inter polos A, a, Scobis figura eſt eadem, ac ſi ambo Ma-
<
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/>
gnetes in eodem jacentes horizontali plano polis alterni nominis ſc
<
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ſpectaſſent, non Scobis fit fuga, ſed amica attractio, a viribus
<
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conſpirantium polorum excitata.</
s
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<
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xml:space
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<
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xml:space
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">Si Limatura Ferri infundatur tubis vitreis, atque arcte compin-
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gatur, fit æque apta recipiendo vim Magnetis, quam Ferri fruſtum
<
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unitum, ut docet ejus affrictio ad Magnetem, & </
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<
s
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xml:space
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">vis deinde explo-
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rata, nam ab hoc non differt, niſi quod partes in maſſa ſunt ar-
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ctius unitæ inter ſe, quam in Limatura attamen in Limatura com-
<
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pactâ ſe bene contingunt: </
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<
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xml:space
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">ſi vero hæc Limatura commoveatur,
<
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quaſſeturque, ut partes locum ſuum mutent, illico omnis earum vis
<
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perit: </
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<
s
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xml:space
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">nam fricantur partes inter ſe diverſiſſimis directionibus; </
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<
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xml:space
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admodum autem virtus ex Ferro auferebatur, cum contraria directio-
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ne eidem polo Magnetis affricabatur quam ante, ita per ſimiles con-
<
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trarias frictiones vis ex Limatura perit.</
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<
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xml:space
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autem Ferrum eſt maſſa admodum compoſita, ex Sulphure, Sale,
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Terra, examinandum erat, quid inſit Ferro, quod attrahitur: </
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<
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Sulphur, an Sal, an Terra, an autem hæc omnia ſimul poſtulen-
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tur permixta?</
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</
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<
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<
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