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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terius naturæ; </
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<
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">ſi quoque ejuſmodirelatio, acinter mentem & </
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noſtrum exiſtit, daretur. </
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<
s
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xml:space
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">Quia autem obſervamus limaturam Ferri a
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Magnete viribus donatam, extemplo earum jacturam facere, ſimulac
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partes inter ſe miſcentur, an eodem modo Ferrum cuſum vires amit-
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tit, quoniam quoque variæ partes inter ſe miſcentur, alioque po-
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nuntur ordine? </
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<
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xml:space
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">Hoc quidem probabiliſſimum videtur: </
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<
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">reſtat tamen
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difficultas quomodo vires pereant ordine partium turbato.</
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">EXPERIMENTUM LVI.</
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s
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">Lamina ferrea, quæ fortiſſimo affricta Magneti viribus imprægna-
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ta fuit eximiis, imponatur Igni, ut penitus candeſcat, calida appo-
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natur Limaturæ Ferri, ejus nullam particulam attrahet: </
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<
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">manifeſto
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indicio in hac calente lamina nullas ſupereſſe vires attrahentes. </
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<
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venit hoc cum Experimento XXIX. </
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<
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">Magnetem Igni commiſſum
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ſpectante, qui etiam vires ſuas ſcobem attrahendi amiſit: </
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<
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xml:space
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fert Ferrum a Magnete, neque vis Magnetica diverſa eſt in Ferro
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& </
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<
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">Magnete, ſi igitur Ignis eam ejiciat ex uno, cur non expunge-
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ret ex altero, Ecce mirandas virtutis Magneticæ proprietates nunc
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in eam agit Ignis, nunc nihil agit, tranſit vis per flammam Spiri-
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tus & </
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">olei accenſi illibata, expellitur tamen & </
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">deſtruitur ab Igne,
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hærens in corporibus ferreis & </
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">Quoniam lamina vires Magneticas in Igne deponit, explorandum
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erat, an Magnes cum Ferro ignito vim communicaret, atque an com-
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municata in Ferro maneret? </
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<
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hoc Experimentum, ſi enim Ignis in Exp. </
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ciat Magneticam, etiam nunc ex eo vim qualemcumque acceptam
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expellet, qui enim in Ferro valde ignito hæret ignis, non diſcre-
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pat ab alio Igne, ſed ecce quam oppoſita phænomena mihi ita ra-
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tiocinanti evenerunt, quæ docere poſſunt Experimentatores, quam
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lente, quam caute in Phyſica pergendum ſit, & </
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perimentis, niſi crebro repetitis a dexterrimis obſervatoribus, con-
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fidere poſſumus; </
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<
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inculcatur, omnem feſtinationem eſſe â Diabolo, feſtinans enim & </
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