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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371. </
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">proſtat ejuſmodi obſervatio, adeoque confirmatur præcedens
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nota, nempe hanc partem Lineæ motam fuiſſe verſus Ortum, hoc eſt
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verſus Promontorium Bonæ Spei: </
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<
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xml:space
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">Sed operæ pretium erit mo-
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tum hujus Lineæ, quam Meridianum Magneticum haud incongrue
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vocaremus, ex vetuſtioribus eruere obſervatis: </
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<
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">Anno 1638 Vien-
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næ in Auſtria non declinavit Magnes, nec Londini Anno 1657,
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nec Pariſiis anno 1666. </
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<
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">nec anno 1600 in Promontorio Africæ das
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Aguilhas: </
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<
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">ante hæc tempora in memoratis locis, & </
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<
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">in omnibus Eu-
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ropæ Africæque regionibus magis ad Occidentem fitis, Declinatio
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Magnetis Orientem verſus obſervabatur: </
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<
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">è contrario in locis magis
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ad Orientem vergentibus regnabat Magnetis Declinatio Occidenta-
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lis: </
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<
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xml:space
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">Meridianus hic Magneticus ita comparatus eſt, ut ad ſuum la-
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tus occidentale Declinationem Orientalem habeat, ad latus orti-
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vum occidentalem: </
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<
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">Quamobrem hic idem fuit, qui annis ſupe-
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rioribus tranſiit ſupra Viennam, Londinum, Lutetias, promonto-
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riumque das Aguilhas, atque progreſſus fuit verſus Occaſum, ſimul
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â parte Boreâ Terræ deſcendendo quaſi verſus Auſtrum, velociori-
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que motu percurrendo Europæ regiones & </
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quam quidem Africæ ultimas terras, & </
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& </
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<
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">quia Halleyus pro anno 1700, atque Feuillejus octo annis poſt,
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ad latitudinem Bor. </
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num hunc permanſiſie in eodem loco notant, cujus tamen pars Bo-
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rea perpetuo magis Occaſum verſus declinare pergit, cum pars Au-
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ſtralis Ortum verſus incedat, uti modo adnotavimus, liquet locum
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a Feuillejo inventum eſſe inſtar alicujus centriſuper quo Meridianus
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Magneticus librationis ſpeciem patitur, ita ut cum unâ parte Oc-
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caſum verſus moveatur, altera Orientem verſus incedat; </
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<
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jus Meridiani motus poſtera deteget ætas, modo ab omnibus nau-
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tis Oceanos Atlanticos & </
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accuratæ capiantur quotidie Declinationum Magneticarum obſer-
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vationes.</
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<
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">Sinunciterum introſpiciamus Mappam Halleyi, dantur aliæ curvæ
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inter Lineam expertem Declinationis & </
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ſupraloca eam paſſa Declinationis quantitatem, quæ deſignantur nu-
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meris 5, 10, 15, 20, 25: </
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Declinatio verſus Ortum: </
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