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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circo vis Magnetis non tanta cum efficaciâ in Ferrum rubiginoſum
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agit quam in purum: </
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chenio in Clave Hippocr. </
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<
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<
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rubigine acidum ferri exſpiravit, & </
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<
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gnes ſcilicet) non percipit.</
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<
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">Magnes inermis, qui poteſt elevare maſſam ferream duarum un-
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ciarum, quod eſt maximum pondus ab eo ſuſtinendum; </
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<
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xml:space
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rit tamen elevare aliud Ferrum unciæ unius cum uncia alterius me-
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talli, etiamſi ſuperficiem ſimilem priori maſſæ habuerit: </
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<
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modum recte obſervavit Dechales.</
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<
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">Magnes in aliquot partes ope ſerræ dividatur, ne concuſſione in-
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teriora ejus turbentur, tum ſumma ponderum Ferri, quam omnia fra-
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gmenta ſeorſim examinata ſuſtinent, multum ſuperat illud pondus,
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quod antea â Magnete integro elevabatur.</
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<
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<
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nores novi plurimos, qui vim attrahentem decies, vigeſies & </
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<
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ſuperantem ſuum pondus poſſident; </
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<
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quingenties gravitatem excedebat: </
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<
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ſiderari poteſt inſtar congeriei plurimorum parvorum, in unam con-
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junctorum maſſam, hi ſibi additi nequeunt tantam vim in Ferrum
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exercere, quam ſeparati: </
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<
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XVI. </
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eſt diſtantia: </
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<
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">qui attollere poſſit Fer-
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rum B, concipiatur diviſus in 9 partes, quas figura exhibet, appa-
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rebit intuenti, Ferrum B eſſe quidem immediate applicatum parti-
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bus 1, 2, 3. </
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">Sed diſtare a partibus 4, 5, 6 craſſitie partium in ſe-
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rie anteriori, quamobrem hæ agent modo in Ferrum, quemadmo-
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dum Magnes in id, tantopere a ſe remotum, operatus fuiſſet: </
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autem partes 7, 8, 9. </
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<
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">multo plus diſtant â Ferro B, quam ſeries
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media, iterum minus in illud operabuntur; </
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