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.
"/>
retenta, fortiter limata, donec incipiant calere, magnam vim at-
<
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tractricem habent, imo majorem quam frigefacta.</
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<
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<
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<
s
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xml:space
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">Quodcunque corpus Chalybeum, valde ſupra ſolum frictum,
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uſque ad caloris gradum notabilem, manifeſtam attractionem o-
<
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ſtendit, quam tamen, ſimulac frigeſcit, amittit: </
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<
s
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echoid-s6449
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xml:space
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">hæc jam inno-
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tuere Boyleo, atque ab ipſo deſcripta ſunt in Mechan. </
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<
s
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echoid-s6450
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xml:space
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">prod. </
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<
s
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xml:space
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">of Magne-
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tics Sect. </
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<
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xml:space
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<
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xml:space
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<
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xml:space
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<
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xml:space
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">& </
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<
s
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xml:space
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">a Ballardo in Philoſ. </
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<
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xml:space
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<
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<
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xml:space
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addente, attritu polos Ferri immutari: </
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<
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xml:space
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">cultrum enim Magneti af-
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fricuit, quo cuſpis evaſit polus Auſtralis, tum cultro vehementer
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attrito contra lignum durum ſiccumque uſque ad inſignem calorem,
<
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cuſpis vim poli Auſtralis amiſit, mutata in polum Boreum, quod
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ſæpius ipſi hoc repetenti, eodem modo obſervari contigit. </
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<
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xml:space
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tandum tamen hæc tantum evenire in cultro tenui, craſſior enim
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attritu non amiſit polos, quos Magnes impreſſerat, partibus nem-
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pe non ſatis concuſſis.</
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<
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<
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xml:space
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">Sed longe pluribus hæc doctrina ditari poſſet, & </
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<
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xml:space
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">mereretur, ob-
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ſervationibus, quæ vim Ferri attractricem, æque ac directricem
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ſpectant, quia eruendæ cauſæ Magneticæ inſignem lucem afferre
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aliquando poſſent; </
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<
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xml:space
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">aſt ſatis prolixus evaſi, brevem tantum diſſer-
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tationem, non volumen conſcribere in animum induxi; </
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<
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tiones quas attuli, primariæ ſunt, noſtraque inventæ aut demonſtratæ
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tempeſtate, quibus coronæ loco addam aliquam, ſæpius a me notatam,
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vim Univerſalem directricem confirmantem; </
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<
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xml:space
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">Tenuiſſimæ Ferri
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ſquammæ, quæ inter cudendum aut tundendum ab Incude decidunt
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in fabrorum officinis, ſeſe omnes attrahunt, dirigunturque Boream & </
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Auſtrum verſus, jacentes exporrectæ ſecundum Magneticum Me-
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ridianum, modo ſolum, cui Incus inſiſtit, fuerit planum, ligneum-
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que.</
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<
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xml:space
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">Ex hiſce Experimentis colligimus vim Magnetis, gremio Terræ
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incluſi, eſſe admodum univerſalem, eam ſe extendere per totum
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Terrarum orbem, agere in omne Ferrum, id dirigere, haud aliter
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quam Ferrum allici regique â Magnete ſupra diximus.</
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<
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xml:space
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">Aſt quomodo virtus illius grandis Magnetis comparata ſit, ne-
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quaquam ex huc uſque commemoratis obſervationibus erui poteſt;
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">quamobrem alia a ſeris Nepotibus inſtituenda erunt tentamina, ut
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voti compotes reddantur, & </
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