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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& </
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xml:space
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cad. </
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xml:space
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<
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xml:space
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<
s
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xml:space
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">qui incluſit fila ferrea lapidi, ſed hæc diſpoſuit,
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ut ſua longitudine reſponderent directioni acus Magneticæ, tum
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poſt 10 annos lapis evaſit Magnes verus, filis nempe a rubigine corroſis:
<
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</
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<
s
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xml:space
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">Nonnulla autem fila prius Magneti affricuerat, antequam alteri lapi-
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di incluſerat, volens videre, an non ita fortior generaretur Magnes,
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verum plus virium in hoc lapide non animadvertit. </
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<
s
xml:id
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xml:space
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quod eſt in Magnete, ſimul cum ſua terra vim attrahendi habet; </
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ſi proinde hoc agat in ferreas partes conſtituentes alium Magnetem,
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non admirandum eſt, hoc etiam agere in ferrum purum, ſive in Ma-
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gnetem puriſſimum abſque lapide admiſto, ſic enim ferrum purum
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vocare licebit: </
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<
s
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xml:space
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">Eodem prorſus modo Magnes agit in quælibet cor-
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pora, quibus ferrum eſt intermiſtum; </
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<
s
xml:id
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">imo forte in ea, quæ nihil
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ferri habent, ſed eandem terreſtrem attractricem materiam: </
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<
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in nonnullas plantas; </
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<
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xml:space
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bæo Lib. </
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dentem nigrumque, qui ex arena Indica elicitur, & </
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<
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biginem contrahit, de quo plura inferius: </
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remanet poſt deſtillationem olei Lini, & </
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<
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annotatum eſt in L’Hiſtoire de L’Academie Roy. </
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<
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xml:space
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natum, gemmam, modo fuerit colore ſaturo tincta, affirmante Boy-
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leo, vide Act. </
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<
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<
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">in Lapidem Lough neagh
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calcinatum, notante Molyneux in Phil. </
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<
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impuritates vitri, monente Helmontio, pag. </
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<
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nii liquet, qui in Lib. </
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verba habens; </
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<
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xml:space
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">Quia autem omnis Actio eſt æqualis Reactioni, non poteſt Mag-
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nes agere in ferrum, niſi hoc reciproce in Magnetem agat, adeo-
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que eodem modo ferrum ad Magnetem accedat, quam hic ad fer-
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rum; </
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<
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<
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">Suspenſus fuit Mag-
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nes ex fune longo Libræ alligato, reductusque ope æquipondii eſt
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in æqualibrium; </
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<
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xml:space
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">tum maſſa ferrea ejusdem gravitatis cum Magnete, e
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quatuor a ſe diſtantibus funibus ſuspenſa ex altera Libra, ita ut Magnes
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& </
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<
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">ferrum fere in eadem linea perpendiculari forent, æquilibrium quo-
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que quæſitum fuit; </
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<
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xml:space
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">ſimulac autem tam prope ad ſe admovebantur,
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ut manifeſto in ſe mutuo operarentur, acceſſit ferrum ad </
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