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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dum ponderis grani unius: </
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<
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xml:space
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">inverſi deinde cylindri apici conico etiam
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apponebatur Acus chalybea, graviſfima fuit ponderis 1 {9/10} grani,
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quæ geſtari potuit.</
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<
s
xml:id
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xml:space
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">Diameter ſecundi cylindri fuit {36/100} pollicis, qui etiam ſecundum
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longitudinem ſuper eodem Magnetis polo ductus fuit, ex illius ex-
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tremo circulari etiam tantum Acus, gravitate grani unius, appendi
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potuit, ſed ab omni puncto ſuperficiei circularis attracta ſuſpende-
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batur: </
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<
s
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echoid-s2340
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xml:space
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">Verum inverſo hoc cylindro, ex coni apice deorſum ſpe-
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ctante ſuſpendi potuerunt aliquot Acus, quarum omnium pondus
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fuit 7 {1/2} granorum.</
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<
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</
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<
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<
s
xml:id
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xml:space
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">Tertii cylindri Diameter fuit {12/100} pollicis, ex cujus extremo cir-
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culari ſuſpendi etiam modo potuit Acus Chalybea ponderis unius
<
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/>
grani; </
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>
<
s
xml:id
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xml:space
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">verum ab apice conico plurimæ gerebantur Acus, quarum
<
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omnium ſibi adhærentium pondus erat 8 granorum.</
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>
<
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xml:id
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</
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<
s
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">Ex quatuor his tentaminibus ſequitur, quo Ferrum eſt craſſius,
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eo minori viâ Magnete eodem imprægnari, tenuiſſimum enim plu-
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rimam virtutem, quia maximum onus geſtabat, recepit: </
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<
s
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xml:space
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">An tamen
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Ferrum, quo plus attenuatum, fed ejuſdem longitudinis, ſemper
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eo majori vi Magnetica imprægnabitur? </
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<
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">hoc etiam exploratum fuit,
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eventu tamen probante determinatam poſtulari Ferri craſſitiem, quæ
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maximum pondus attrahat, aliam vero omnem minorem etiam exi-
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liori gaudere virtute.</
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</
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<
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xml:id
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xml:space
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">Cylindrus enim tenuior, Diametri {12/100} pol. </
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<
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xml:space
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">ejuſdemque cum priori-
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bus longitudinis, tantummodo ex apice conico pondus ferreum 4
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granorum geſtavit: </
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<
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xml:space
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">& </
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<
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xml:id
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xml:space
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">fila tenuiora ferrea ſuper eodem deducta Ma-
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gnetis polo, iterum pondera ferrea leviora tantum attraxerunt:
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</
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<
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xml:space
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">quare datur craſſities Ferri, quæ a polo dati Magnetis, maxima vi
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attractrice induitur, aliaque omnia ferramenta, craſſiora vel te-
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nuiora minorem vim ab eodem Magnete recipiunt.</
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<
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xml:space
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">Extremitates autem conicæ cylindrorum videntur ad apicem ob-
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tuſum condenſare aut colligere vim Magneticam, quia ex hiſce api-
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cibus pondus ferreum multo gravius, quam ex plano extremo cir-
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culari geſtatum fuit: </
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<
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xml:space
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">Cylindros deſcriptos eum in finem præparave-
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ram, ut detegerem an inter craſſities, longitudines, & </
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<
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">vires a Ma-
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gnete cum ipſis communicatas quædam proportio daretur, ſed mihi
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ipſi in hiſce Experimentis non ſatisfeci, neſciens utrum majori </
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