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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INTRODUCTIO AD COHÆRENTIAM
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<
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in ſequenti, quæratur quanta ſit Cohærentia abſoluta ejusdem cor-
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poris ſub determinata craſſitie, hæc Cohærentia vocetur a. </
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craſſities ſit b c. </
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<
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xml:space
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in data longitudine, quæ ſit = g, & </
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<
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</
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<
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xml:space
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">erit igitur Cohærentia abſoluta a ad ſuam craſſitiem b c. </
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<
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xml:space
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corporis cum pondere annexo = g + p ad craſſitiem quæſitam: </
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<
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<
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quæ tum erit = {b c g + b c p.</
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<
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xml:space
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<
s
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xml:space
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">? nam pondus geſtandum g + p eſt æqua-
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le Cohærentiæ abſolutæ corporis dati ſub determinata craſſitie.</
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<
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<
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<
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xml:space
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">Hinc dato pondere ſuſpendendo ex catenis ferreis, filis
<
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metallicis, funibuſve aut Lignis, aut datâ vi hæc corpora tenden-
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te, â priori determinari ſemper poterit, quantæ craſſitiei deſide-
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rantur, ne rumpantur: </
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<
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xml:space
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">Eſt hoc Problema magnæ utilitatis in praxi,
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ne corpora ex quibus pondera ſunt ſuſpendenda, capiantur nimis
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tenuia, atque ita olei & </
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<
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">operæ jactura fiat; </
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<
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xml:space
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">tum ne corpora craſ-
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ſiora componantur, quam debent, inanesque fiant impenſæ.</
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<
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<
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xml:space
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cunari affixa, ita ut axis C A ſit perpendicularis ad borizontem,
<
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qui ſecetur plano borizontali D G, erit Cobærentia abſoluta baſeos
<
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B F ad ſoliditatem coni A B F in minori ratione, quam Cobærentia
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abſoluta baſeos D G in ſegmento ad ſuam ſoliditatem.</
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<
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<
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xml:space
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">Concipiatur ſuper baſi B F factus cylindrus altitudinis C A, qui
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fit B K P F, tum ſuper baſi ſegmenti D G cylindrus ſit æque altus
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O I L M. </
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<
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xml:space
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">erit Cohærentia abſoluta cylindri B K P F ad Cohærentiam
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cylindri O I L M abſolutam, uti baſis B F ad baſin O I per propoſ.
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</
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<
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<
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xml:space
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">eſt ſoliditas cylindri B K F P, ad ſoliditatem cylindri O I L M,
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uti baſis B F ad O I baſin: </
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ſe uti baſes: </
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tione, quam eadem baſis O I ad ſoliditatis prioris portionem, ſive ad
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D L M G. </
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">Ergo erit Cohærentia, in O I, ſive in æquali D G, ad ſolidita-
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tem D L M G in majori ratione, quam cohærentia O I ad ſoliditatem
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O I L M: </
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