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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ſiderari: </
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<
s
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xml:space
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">huc uſque tantum aliquid de Magnete ſubolfacimus, quem
<
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ignoraverunt penitus antiqui: </
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<
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xml:space
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<
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xml:space
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">nos plura
<
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illis tentaſſe, obſervaſſe aliquem progreſſum, aliquem motus ordi-
<
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/>
nem antea incognitum, idque noſtri temporis Philoſophis ſufficere
<
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judicavit Fontenellius in L’Hiſt. </
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<
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xml:space
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">de L’Acad. </
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<
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<
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<
s
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xml:space
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">1712, ne
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animo deſpondeant in mediis Anomaliis, quibus Magnes abunde
<
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luxuriat: </
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<
s
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xml:space
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">Hæreat igitur Magnes in imis Terræ viſceribus, ad quem o-
<
lb
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mnes noſtri Magnetes, omnes Acus Nauticæ & </
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>
<
s
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xml:space
="
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">Inclinatoriæ, omne
<
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/>
Ferrum denique dirigitur attractum, eodem modo ac a noſtris Magneti-
<
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bus attrahuntur alii, nihilominus id reſtat, quomodo & </
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<
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xml:space
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">â quâ cauſâ iſta
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attractio perficiatur: </
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<
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xml:space
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">Cauſa effectuum ſimilium procul omni dubio
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erit eadem; </
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<
s
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xml:space
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">quæ enim noſtros Magnetes ad ſe appropinquare facit,
<
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ea Magnetes in ſuperficie Terræ dirigit trahitque verſus grandem
<
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iſtum in Terræ gremio concluſum Magnetem: </
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<
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xml:space
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">An hæc cauſa erunt
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effluvia corporea, aut fluidum aliquod perpetuo curſu agitatum,
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quod ex imis Terræ penetralibus egreſſum, circulum circa Terram
<
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obit, per Aërem, & </
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<
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xml:space
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">ipſam Terræ ſubſtantiam circumlatum rapi-
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diſſimi inſtar fluminis, quod ſecum abripit Magnetes noftros, Acus,
<
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& </
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<
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">Ferrum omne, dirigitque certas verſus plagas? </
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<
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xml:space
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">Nequaquam profe-
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cto, evicimus enim ſuperius plurimis argumentis ex experimentis
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tantummodo petitis, Magnetes noſtros non regi ab effluviis, nec
<
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quocunque alio admiſſo fluido explicari poſſe phænomena, con-
<
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feſſi fuimus poſt totidem examina animum hebeſcere, neque cauſam
<
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divinari, aut demonſtrari potuiſſe: </
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<
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">eadem abdita hic regnat cauſa;
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</
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<
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xml:space
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">priorem qui invenerit, hanc quoque intelliget, ab ea tantum di-
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verſam magnitudine, non operatione attrahente vel dirigente: </
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<
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tequam igitur demonſtrari Geometrice poſſit directio Verſorii, In-
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clinatio Acus, & </
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">virium agentium quantitas, exſpectandum erit, do-
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nec cauſa Magueticarum virium eruta fuerit.</
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<
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xml:space
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">Utcunque exiguum in Magnetica doctrina fecerimus progreſſum,
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nihilominus experimentorum ope errores antiquorum deteximus, at
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que eſſe abſonas eorum hypotheſes, nimiſque temere effictas, qua-
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rum ope directionem Magnetis ſe explicare confifi ſunt: </
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veterum ſcholas, atque breviter percurramus opiniones præcipuas,
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omnes enim examinaſſe non juvat.</
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