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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Anno # # Grad. # Minut.
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1717 # circa initium æſtatis # 10 # 42
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# 26 Novembris # 10 # 55
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1724 # 13 Auguſti # 11 # 45
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1725 # 14 Junii # 11 # 56
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<
s
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">Ex quibus obſervationibus attribuit Acui progreſſum 9, 15``, pro
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quolibet Anno: </
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<
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">Si numerus rotundus 9 ſumatur pro vero, tum ſpa-
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tio 2400 Annorum integrum circuitum Declinatio abſolveret. </
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<
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ſpicatur Whiſtonus revolutionem peractum iri intra 1920 Annos:
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</
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<
s
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xml:space
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">Revera reſtant in hac doctrinâ Magnetica, quæ nequaquam accu-
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rate determinari hucuſque poſſunt: </
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<
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xml:space
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">Verſamur tantum in principio
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hujus ſcientiæ, quæ modo poſt plurimos annos, ac poſt multas
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obſervationes perfici & </
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<
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">demonſtrari poterit.</
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<
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">Videntur Brittanni primi de integrâ revolutione Acus,
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aut poli Magnetici terreſtris cogitaſſe, unde aliquis, nomine Phi-
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lips, aſſeruit, hanc revolutionem peractum iriſpatio 370 annorum:
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</
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<
s
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xml:space
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">deinde Bondius eam intra 600 annos perfici credidit, in Treatiſe
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Longitude found, p. </
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<
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<
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bat eam abſolvi intra 700 circiter annos.</
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">Si Tabulam Brittannicam comparemus cum Pariſienſi,
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obſervamus in Brittannia Acum 9 annis citius verum Boream indi-
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caſſe, quam Pariſiis; </
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<
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">quod provenire videtur, quia Londinum 2°,
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25` jacet occidentalius.</
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<
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xml:space
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">Auzoutus Romæ obſervavit Anno 1670 Declinationem eſſe vel
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2 Graduum, vel 2°, 30` verſus Occaſum, uti notatum eſt in Phi-
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loſ. </
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">Jacet autem Roma Orientalius 11°, 48` Lutetiis,
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quare major Declinatio verſus Occaſum Romæ fuit, quam eodem
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anno Lutetiis, imo & </
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<
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">major fuit Londini hoc anno, licet Londi-
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num jaceat occidentalius, & </
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<
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">fuit hic Declinatio fere eadem, quæ Ro-
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mæ, quod indicat, fere æqualiter utrimque a linea experte Decli-
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nationis Londinum & </
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<
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">Interim admirandum eſt, cum Pariſiis anno 1666 nulla fuerit De-
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clinatio, uti Londini Anno 1657, & </
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<
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">ante hoc tempus Acus græciſſabat,
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ipſam tamen Regiomonti diu ante fuiſſe Occidentalem & </
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<
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manſiſſe: </
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