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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dat. </
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<
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xml:space
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">Sit regula ferrea craſſa ABGM, quæ ſupra incudem tun-
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datur Mallei parte plana lataque C, nullam vim attractricem
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acquiret: </
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<
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xml:space
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">hâc tamen tuſâ parte Mallei acutiori D, incipiendo ab
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E verſus B, acquiret extremitas A aliquam vim, quamquam de-
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bilem, neque alibi, aut in aliqua parte circa loca pulſata vis ob-
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ſervabitur: </
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<
s
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xml:space
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">Deinde autem pulſus fiant ſecundum longitudinem
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FP in medio regulæ, cavendo ne cudantur partes FEBP, aut
<
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FLMP, niſi exigua tantum recta plaga FP, & </
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<
s
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xml:space
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G vi donabuntur, nequaquam autem pars media inter AG.</
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<
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xml:space
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">EXPERIMENTUM CXLIV.</
head
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<
p
>
<
s
xml:id
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xml:space
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">Simulac aliquod ferreum inſtrumentum ſecat aliud frigidum
<
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Ferrum, vim attractricem acquirit; </
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<
s
xml:id
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xml:space
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">ſed ſi ſecat vel abradit Fer-
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rum igne candefactum nullam, imo quam antea habuit, amittit.
<
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</
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<
s
xml:id
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xml:space
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">Si Chalybeus cuneus, Magnetica vi donatus, adigatur Malleo
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ut Ferrum candens findat, vim quoque ſuam amittit.</
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<
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</
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<
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xml:space
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<
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<
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xml:space
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<
s
xml:id
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xml:space
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">majorem vim at-
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tractricem nanciſcuntur, quam quæ deſinunt in latitudinem vel
<
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planitiem, unde ceſtrum ſuâ cuſpide plus attrahit, quam culter:
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</
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<
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xml:space
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">Quo ceſtra ſunt breviora, eo minori vi donantur, obſervavit
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enim Reaumurius, ceſtrum longitudinis unius pollicis, & </
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<
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9 linearum, etiamſi bene perforaſſet Ferrum, non niſi aliquot ra-
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menta; </
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<
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xml:space
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">contrà ceſtra 3 vel 4 pollicum, & </
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<
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xml:space
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">diametri 1 vel 1 {1/2}
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lineæ parvos clavos attraxiſſe. </
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<
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xml:space
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">Videntur autem ceſtra virium
<
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attractricium incremenra capere in ipſa rotatione, qua Ferrum
<
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vel Cuprum, vel lapidem perforant, hoc recte annotantibus Hoo-
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kio in Experimentis â Derhamo editis pag. </
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<
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Philoſ. </
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">246, tum Reaumurio in L’Hiſt. </
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<
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Roy. </
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<
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xml:space
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">hinc non eſt admirandum Limaturam a ceſtro conta-
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ctam atque ex foramine exſculptam vi Magnetica gaudere, quam
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a ceſtro accepit.</
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