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.
"/>
Ignis tantummodo illud domat, quippe leni Igne Magnes calefactus
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vires non perdit: </
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>
<
s
xml:id
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echoid-s1726
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xml:space
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">Sæpe jungunt artifices multa Magnetum fragmenta
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ſecum invicem, circa illa circumfundendo liquefactum plumbum,
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ſtannum, vel aliud compoſitum metallum, neque vires ab eo cor-
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rumpuntur calore, ſed manent integræ ſtabileſque: </
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<
s
xml:id
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xml:space
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">quamobrem hæ
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fortiter inhærent Magneti, non expellendæ niſi vi ſumma diutiſſi-
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me continuati Ignis, aut ab eo tantum domandæ: </
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<
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xml:space
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">Attamen reſtat
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hic aliquid obſcuriſſimum, quidnam nempe ſit illud in Lapide, in
<
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quo vires ſedent? </
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<
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xml:space
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">& </
s
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<
s
xml:id
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xml:space
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">quomodo id ab Igne agitatur, mutaturve, ut
<
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ex agenti fiat iners? </
s
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<
s
xml:id
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echoid-s1731
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xml:space
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preserve
">hic mentis acies hebeſcit, hoc ſolo autem in-
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tellecto omnis Magnetum effectus & </
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<
s
xml:id
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xml:space
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">operationes cognoſcerentur:
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</
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<
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xml:space
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">Si id corporeum ſit, & </
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<
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xml:space
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">ex Magnete exeat, quando operatur, daren-
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tur Effluvia, a quorum affluxu, & </
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<
s
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xml:space
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">refluxu omnia phænomena ori-
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rentur, verum ſuperius monuimus, quibuſnam Effluviorum doctri-
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na urgeatur difficultatibus, adeo ut hoc ſtatui nequeat: </
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<
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xml:space
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ſit; </
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<
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xml:space
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">ex Magnete non exeat, quomodo tum corpora ad multorum
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pedum intervallum agitabit, movebit, ad ſe alliciet? </
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<
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">Neque hoc
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animus ullomodo comprehendit. </
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xml:space
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">Verum an non eſt ſtabilita Lex
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Naturæ; </
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<
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xml:space
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">atque â Creatore impreſſa omnibus corporibus, ut poſitis
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his ſibi propinquis, vel ad aliquod intervallum, ſe attrahant, ad
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ſe accedant, & </
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<
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xml:space
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">cohæreant, quamvis nihil extrinſecus pellat, nihilque
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in intermedio ſpatio ſit, quod ea attrahat, an poſita hac Lege Magnes
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non accedet ad Magnetem aut ad Ferrum, omneſque ejus operationes
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inde fluent? </
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<
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">Quamvis ejuſmodi Legem ab omnipotente Creatore
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latam eſſe conceſſero, non tamen vi ejus fluent, aut ex ea explicari
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poterunt phænomena, quæ Magnes conſpicienda præbet: </
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xml:space
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">Quippe
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ſive Igni commiſſus fuerit, ſive ex fodina modo ante erutus, ſub eo-
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dem volumine manente ejus eadem maſſa corporea, eædem quoque
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vires attrahentes obtinerent: </
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<
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">in Naturæ Legem Ignis non egit, nec
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eam immutare, nec deſtruere potuit: </
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xml:space
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">Ignis tamen potiſſimum virtutis
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ex Magnete fugavit: </
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<
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xml:space
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">verum pluribus obnoxia eſt hæc ſententia dif-
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ficultatibus, conſtantis enim eſt obſervationis, Magnetem fortiter
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Malleo percuſſum, ita ut omnes contremuerint partes; </
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verem contritum, rubigine obductum, aëri humido diu expoſitum,
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ſitu inverſo in Meridiano ſuo jacentem, prope alium fortioribus vi-
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ribus donatum, virtute orbari, infringi, debilitari, id </
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