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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do de Acu Inclinatoria agam; </
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">ſuſpicabar an in noſtris Experimentis,
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in quibus Magnetem unum ſupra alterum ſuſpendebam ex Libra, et-
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iam non oriretur quædam depreſſio Magnetis horizontem verſus ra-
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tione virtutis Univerſalis directricis, atque ita pertur baretur accura-
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ta menſura virium attractricium; </
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<
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xml:space
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">verum evanuit ſcrupulus, cum
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animadvertebam hanc vim directricem deprimentem Magnetem ef-
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ficere quaſi quandam partem gravitatis Magnetis; </
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">& </
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<
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xml:space
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">quia hæc vis
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ope ponderis ſimul cum gravitate ad æquilibrium reducebatur ante
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inſtitutum Experimentum, & </
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">ſemper manebat æque magna, non
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poterat turbare obſervationes circa attractiones factas.</
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">Parallelopipedum ferreum, pondere 5 librarum, in lance ænea
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poſitum, pendente ex æneis catenis Libræ adnexis ad æquilibrium
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ope ponderum oppoſitæ lanci immiſſorum reductum fuit, tum igni
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commiſſum eſt vehementi, donec ruberet, non tamen ſcintillaret,
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deinde rurſus eidem impoſitum eſt lanci, infra quam Magnes ſphæ-
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ricus major NO Tab. </
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<
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">habebatur, ad diſtantiam duorum accurate
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pollicum: </
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<
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xml:space
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">ſtatim deorſum tractum fuit hoc ignitum ferrum a Magne-
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te; </
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<
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">tum vero vis attractrix explorabatur, injectis alteri lanci pon-
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deribus uſque ad æquilibrium; </
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<
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">inter refrigerandum continuo magis
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magiſque increvit Magnetis attractio, quæ æqualis erat 3 granis,
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â ſummo calore uſque ad eum, quem manus vix vix ferebat; </
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<
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ferro ad eundem calorem cum atmoſphærico aere redeunte, iterum
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increſcebat attractio 4 granis, adeo ut tora diſſerentia attractionis
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a ſummo calore uſque ad eum, qui in aere erat, fuerit in diſtantia
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2 pollicum æqualis 7 granis; </
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<
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">vis tamen hujus Magnetis in idem fer-
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rum frigidum fuit 16 granorum, adeoque fere ad dimidium decre-
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vit poſito ferro calidiſſimo. </
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<
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">Repetitum poſtea fuit Experimentum cum
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eodem Magnete & </
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adhuc ferrum a Magnete attrahebatur vi 61 granorum, ſed igne ſum-
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mo candefactum vi 26 granorum; </
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<
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rit 35 granorum, vehementius in hoc Experimento calebat ferrum
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quam in priori, & </
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