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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CORPORUM FIRMORUM.
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deret: </
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<
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xml:space
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">Supervacaneus videbitur Geometris noſter labor, imptimis
<
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cum demonſtravimus in Propoſitione VIII. </
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<
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xml:space
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">duorum corporum cylin-
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dricorum ejusdem materiæ, diverſam craſſitiem habentium, Cohæ-
<
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rentiam fore in ratione craſſitierum: </
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<
s
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xml:space
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">quod veriſſimum eſt, & </
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<
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xml:space
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">in-
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ſtar Axiomatis ponendum, ſi corpora, quibus vis infertur, ut fran-
<
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gantur, maneant æque craſſa; </
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<
s
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xml:space
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">ſed an ea, quæ cedunt interim ob
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flexilitatem, & </
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<
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xml:space
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">attenuantur, qualia ſunt Metalla, eidem Legi ſub-
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jiciantur, mihi non ſatis liquido conſtabat; </
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<
s
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xml:space
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">de eo dubitaſſe poſtea
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non pœnituit, cum Experientia evicerit, hic aliquid latere, acceden-
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te Cohærentia quidem utcunque ad craſſitierum proportionem, non
<
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tamen accurate. </
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<
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xml:space
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">Verum prius apparatum Experimentorum exacte
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deſcribam: </
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<
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xml:space
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">Præparata fuerunt ex quolibet Metallo fila quatuor,
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craſſiſſimi diameter erat {1/10} pollicis Rhenolandici, hoc in poſte-
<
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rum inſigniam littera A. </
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<
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xml:space
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">Secundum, cujus craſſities minor erat,
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habebat baſin vel craſſitiem, quæ ad eam in A fuit exacte uti 3 ad
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4 hanc craſſitiem vocabo B. </
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<
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xml:space
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">Tertii fili craſſities ſive baſis erat ad
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eam B uti 2 ad 3. </
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<
s
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xml:space
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">hanc craſſitiem vocabo C. </
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<
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">Quarti fili craſſities
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erat ad eam C uti 1 and 2. </
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<
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xml:space
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">hanc vocabo D. </
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<
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xml:space
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">erant igitur baſes, ſive
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craſſities filorum, uti 4, 3, 2, 1.</
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</
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<
s
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xml:space
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">Fila omnia craſſitiei A ducta fuerunt per idem foramen lamellæ
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indurati Chalybis inflictum, ut accuratiſſime forent æque craſſa:
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</
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<
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xml:space
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">ita per aliud foramen ducta fuerunt fila omnia B. </
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<
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C. </
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<
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</
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<
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<
s
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xml:space
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">Quoniam omnia Metalla majorem rigiditatem acquirunt cum ita
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ducuntur per hæc foramina, igni carbonum ligneorum puriſſimo-
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rum immitebantur Aurum, Argentum, Cuprum, Ferrum, & </
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<
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xml:space
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">le-
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viter candefacta, emollita fuerunt tam æquabiliter quantum fieri po-
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teſt, cavendo ſimul ne ſuperficies ſcorias contraheret, atque ita te-
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nuius fieret filum: </
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<
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xml:space
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">ut hæc ope Machinæ divulſoriæ examinaren-
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tur, confecti fuerunt duo ferrei unci. </
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<
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<
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duplo longiores & </
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">craſſiores quam hic depinguntur, quorum capi-
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tibus A, B inflicta erant foramina quadrata, quibus conveniebant
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pinnæ fieret, formæ & </
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<
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</
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lum metallicum circumvolvendum fuit, eratque ad latus pertuſum
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foramine K, per quod filum transmittebatur, ut melius figi </
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