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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DISSERTATIO
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li filorum cognomines ſibi impoſiti fuerunt ad longitudinem dimi-
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dii pollicis, atque aliquot ictibus mallei percuſſi ſupra lapideam in-
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cudem, quibus ſupra ſe invicem applanabantur; </
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planata unius fili obverſa Verſorii cuſpidi Boreæ, quam ante re-
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pulerat, nunc attraxit, alterius fili eadem extremitas polum
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Boreum Verſorii repellebat, ut ante.</
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head
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tium, ferream componentium maſſam, ſitum directioni Magneti-
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cæ differentiam afferre, antequam eam ſtabilirem ſententiam,
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alia tentamina capienda adhuc eſſe ratus ſum, in quibus partium
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ſitus mutatur, ſed modo â prioribus paulum diverſo; </
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<
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xml:space
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4 longum pollices, ejuſdemque cum præcedentibus craſſitiei, ſu-
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per polo Magnetis ductum, altero extremo Verſorii cuſpidem Bo-
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ream attraxit, altero Auſtralem, neque ulla Punctorum Conſequen-
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tium in intermedia aliquâ parte ſigna edidit; </
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<
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anguſtius, laminæ inflictum Chalybeæ, trajectum, quo longitudi-
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nem 5 {1/2} pollicum nactum fuit, manentibus ad utramque extremitatem
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iiſdem polis, vireſque inſignes oſtendentibus, iterum nulla Puncta
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Conſequentia in tota longitudine conſpecta fuerunt: </
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per anguſtius foramen deinde trajecto, quo 7 pollices longum eva-
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ſit, eadem directio, quæ ante, permanſit, attrahente nempe una
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extremitate Verſorii polum Boreum, repellente Auſtralem, & </
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tera extremitate trahente polum Auſtralem, repellente Boreum;
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directionem induxit, aut priſtinam immutavit: </
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in his tentaminibus partium fili ſitus, ita ut forſitan nullæ, quæ
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ſe antea contigerant, ſibi adhæſerint aut in vicinia manſerint; </
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inſigne intervallum â ſe mutuo fuerint remotæ.</
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univerſalis dici, dantur quippe caſus, in quibus aliter dirigitur Fer-
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rum mutatâ ejus formâ, dantur alii, in quibus nulla diſcrepantia
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directionis obſervatur. </
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<
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cæ virtutis cauſa, hæc phænomena clare intelliget, ſunt ea, </
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