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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[Handwritten note 2]
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DE MAGNETE.
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tudo major quoque diametro cylindri.</
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<
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cum parallelopipedis, prout latitudine vel altitudine ſua Magnetem at-
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tigerint? </
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<
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">altitudine ſimul ſuper
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Magnete ductum majores ablaturum vires, quam ſi modo latitudi-
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ne ſua Magneti affrictum fuiſſet, quod in primo parallelopipedo vi-
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debatur obſervari, ſed in ſecundo & </
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<
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">tertio obtinet contrarium, cum
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in iis vires, antea magnæ, imminuantur plurimum, affrictu alti-
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tudinis, ſequente eum latitudinis.</
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<
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<
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">Si comparemus vim attractricem in parallelopipedo 6
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pollices longo, unum pollicem alto latoque, cum iis parallelopipe-
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di primi 4 pollices longo, erunt circiter ut 1 ad 50. </
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<
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xml:space
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">attamen ſi ut-
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riuſque craſſitiei habeatur ratio, erit hæc primi Ferri ad alterius ut
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11 {496/864} ad 1. </
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<
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">quamobrem ſi vis proportionalis craſſitiei communica-
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retur. </
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<
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">geſtanda fuiſſent a parallelopipedo unum pollicem craſſo, 2
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circiter grana, cum modo {1/4} attracta fuit; </
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<
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xml:space
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">datur igitur quædam craſ-
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ſities Ferri in determinata longitudine, quæ viribus ſummis a Ma-
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gnete imprægnatur, ultra quam craſſiora ferramenta, æque ac te-
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nuiora minores vires recipiunt; </
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<
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xml:space
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">Nam lamella 4 longa pollices lata
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{25/100} poll. </
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<
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">alta {1/100} affricta eidem polo Magnetis, inde abſtulit vires,
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quibus modo 12 grana geſtabat.</
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<
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">Incideram, memorata intuitus Experimenta, in ſuſpicionem;
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</
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<
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">Magnetem vibrationibus tremulis agitari, in his vim conſiſtere, eas
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cum Ferro ſibi applicato communicari, idcirco in hoc obſervari ma-
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jores quam in altero, quia facilius recipiuntur. </
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xml:space
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">& </
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<
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">melius retinentur: </
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Quoniam vero pannus fidibus pulſatis ſonantibuſque applicatus, ex-
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templo tremores ſonoſque ſuffocat, videbatur quoque vibrationes
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Magnetis imminuturus aut deleturus; </
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<
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">ſuper polo eodem Magnetis
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triplicato panno obducto parallelopipedum tertium (ejus prioribus
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viribus in Igne expulſis) aliquoties ductum fuit, nihilominus inde
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abſtulit vim attractricem 9 granorum. </
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<
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xml:space
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">Deinde pannus duplicatus
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modo obductus fuit polo, idem Ferrum ſupra pannum trajectum vim
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recepit elevandi grana 17. </
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<
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">tandem ſimplici obducebatur polus pan-
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no, idemque trajectum ferrum vim habuit geſtandi 47 grana: </
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<
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pulſa in Igne vi Magnetica ex ferro, ad intervallum 3 linearum
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a Magnete iterum juxta polum trajectum eſt parallelopipedum, </
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