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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quomodo ad ſe appropinquent, an cum iisdem, an cum diverſis viribus
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in variis diſtantiis? </
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<
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">tum quænam proportio virium in dato intervallo
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obtineret? </
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<
s
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xml:space
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">deinde quærenda erat cauſa, quæ moveret pelleretve ver-
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ſus ſe mutuo Magnetes in proportione diſtantiarum obſervata: </
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<
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rum enim cognitionem deſiderant Philoſophi, ut intelligant evidenter,
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quid ſit Magnes, & </
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<
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</
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<
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xml:space
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">In cauſa divinanda multi plurimum operæ poſuerunt ab aliquot re-
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tro ſeculis, verum qualis ſit virium Attractricium proportio ad di-
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verſa intervalla indagaverunt pauci: </
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<
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">Inter primos, qui ad Magnetis
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proprietates intelligendas hoc poſtulari rite animadverterunt, & </
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circo proportionem quæſiverunt, fuit artificiofiſſimus Hauksbejus,
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deinde Nobiliſſimus Taylor, tandem Eruditiſſimus Whiſtonus; </
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<
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varia methodo id Problema ſolvere conati ſunt: </
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">Quoniam vero Hauks-
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bejana methodus nequidem ipſis Britannis ſatisfecerat, neque mihi
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adeo ſimplex viſa fuit, ac deſiderari poſſet, idem Problema arripui,
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conatus id alio ſolvere modo, perquam ſimplici & </
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<
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">naturali, ad
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quem me conſpectus antea memoratorum Experimentorum deduxit: </
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Quemadmodum enim ope Stateræ corporum pondera expendimus,
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ita vires Attractrices ope ponderum in Bilance cognoſci, & </
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comparari poſſe videbam, earumque magnitudo in variis oſtendi di-
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ſtantiis: </
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">quod ut clare intelligatur, methodum deſcribam, ex qua ju-
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dicium ferri poteſt, utrum ſatis accurrate experimenta inſtituta ſint,
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tum ut repeti poſſent cum aliis, quam quibus uſus fui Magnetibus,
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corumque virtus eodem modo explorari & </
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">Elegi accuratiſſimam Libram XG, cujus
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axis admodum acutus politusque erat, ut ſuper eo jugum XG lu-
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briciſſime moveretur, atque ab {1/20} grani parte alterutri extre-
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mitati G vel X impoſita, deprimeretur; </
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<
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">ut Libræ minima quoque
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depreſſio manifeſto conſpiceretur, examen ejus in acutiſſimam termi-
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nabatur cuſpidem, quæ opponebatur pinnulæ tenui V, deorfum promi-
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nenti ex media ſuperiori parte trutinarum, hæ in latos expanſæ ibi an-
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nulos, liberum relinquebant obſervationi locum, an examen accu-
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rate reſponderet pinnulæ, an ab alterutro declinaret latere, & </
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tum, hoc eſt, an æquilibrium ab utroque Libræ latere foret, an ſe-
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cus: </
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ambientemque Magnetem H ſphæricum, quem Terrellam </
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