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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tium, uti diſtantiæ 9 pollicum reſpondet Sinus 2334. </
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<
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18 pollicum Sinus 588. </
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rate, uti 3 {285/294} ad 1. </
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cata diſtantiarum. </
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<
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ſunt inter ſe uti 4 {42/131} ad 1, adeoque hi ſunt in majori proportione ad ſe in-
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vicem, quam ſuperiores Sinus appoſiti diſtantiis 15 & </
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<
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848 & </
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ſtantiis 18 & </
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<
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<
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ti diſtantiis 21 & </
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<
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eſt 6 {2/65} ad 1.</
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</
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<
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xml:space
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">Ex quibus mihi colligendum videtur proportionem dari valde in-
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conſtantem, quæ aliquando eſſet minor quam duplicata, aliquando
<
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paulum major, aliquando multo major duplicata. </
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<
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xml:id
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xml:space
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">Poſuit nihilo-
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minus Whiſtonus rationem hic obtinere Sesquiduplicatam, quoniam
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in Experimentis quædam laxitas Geometrica habenda eſt, id con-
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cedendum omnino, niſi laxitas nimium extendatur, quod hic
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fieri videtur, nimia enim intercedit diſcrepantia, cum Experimenta
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in uno caſu dent proportionem uti 3 {285/294} ad 1. </
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xml:space
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</
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<
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xml:space
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">ut hæ ambæ pro unâ eademque proportione habeantur: </
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<
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video, cur non potius fateamur nullam conſtantem hic dari propor-
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tionem, quam tam mirifice intorquendo Experimenta, ut propor-
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tionem inveniamus, ubi eam Natura negat.</
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</
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<
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xml:space
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">Verum in hac methodo explorandi vires Magneticas difficultas
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quædam latet. </
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<
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xml:space
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">Agitur Magnes aut Acus nautica viribus duabus a
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ſe diſtinctis, una attractrice, aliâ directrice verſus quoſdam in
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Terrâ polos: </
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<
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xml:space
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">vi directrice Acus in hoc Experimento quoque dirigitur
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ad polos. </
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<
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xml:space
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">Cum Magnes Acui opponitur ad diverſas diſtantias, eamque
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a directione priori deflectit, tum vi ſua Attractrice agit in vim di-
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rectricem Acus; </
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<
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xml:space
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">atque eam deflectit, donec vis directrix, in eam ob-
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liquam poſitionem acus agens, æquilibrium inveniat cum vi attra-
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ctrice Magnetis: </
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<
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xml:space
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">adeoque non ita detegitur quantitas virium ſe mu-
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tuo attrahentium in Acu & </
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<
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piamus enim Acum rotatilem ſupra pinnam fixam, poſitam in medio
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flumine quodam, dirigique juxta ejus curſum; </
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<
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dem Acus trahi per funem annexum ripam verſus ita, ut funis ſem-
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per ſit perpendicularis ad Acum, tum ut inflectatur in </
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