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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in hoc Capite commemoravimus, non inter facillima intellectu po-
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nenda; </
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">nunc ignoratâ cauſâ, inſtar talparum fodimus, quærimus,
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inveſtigamus, anfractuoſas ingredimur vias, aliquando ſteriles, ali-
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quando exiguum laborum fructum afferentes; </
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<
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">id tamen poteſt nobis
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eſſe ſolatii, Experimentum recte inſtitutum, accurate cum omnibus
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circumſtantiis obſervatum, manere Experimentum, hoc eſt ſemper
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verum, & </
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<
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">neque illis unquam ſubjici viciſſitudinibus,
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quibus ratiocinium, utcunque ſubtile, ex levi obortum hypo-
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theſi.</
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">Prope Verſorii alterutram extremitatem teneatur aliquod Ferrum,
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non imprægnatum vi Magnetica, niſi quam ſua ſponte acquirit,
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Verſorii directionem mutabit, ad ſe alliciet, non aliter quam verus
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Magnes; </
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<
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">motum proinde ejus ſequetur Verſorium, quod in orbem
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converti, variis in plagis ſiſti, dirigique poteſt pro lubitu, moto
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tantummodo Ferro: </
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">ſi autem vi donatum Magnetica ſit, Verſorium
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longe vehementius attrahet in eadem diſtantiâ ac ante, aut multo
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remotius poſitum nihilominus operationem ſuam demonſtrabit.</
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câ donata, poſita in eodem horizontali plano intra mutuæ actionis
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ſphæram in ſe operarentur: </
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">unum Verſorium, quod huic Experi-
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mento inſerviit, erat 6 {3/4} pol. </
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ſtylo, ſupra quem libere poterat converti, imponebatur: </
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rum alteri parallelum; </
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">centra utriuſque ſive ſtyli jacebant in recta Æquatori Magnetico
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parallela, in qua pro lubitu propius ſibi, aut remotius iterum, pone-
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bantur, quo Verſoria tantundem ad ſe accedebant: </
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brevius ad Ortum longioris ſitum: </
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pollicibus, acceſſerunt ambo poli Borei ad ſe parum, atque tantun-
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dem receſſerunt Auſtrales a ſe: </
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3 poll: </
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