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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<
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xml:space
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,
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. </
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<
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ad
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, ita Cohærentia baſeos D G E ad Cohærentiam ba-
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ſeos A F C. </
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<
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<
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tem momentum ponderis P pendentis ex longitudine B G, ad mo-
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mentum ponderis P pendentis ex longitudine B F, uti B G ad B F,
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quare Cohærentiæ baſium, ſunt inter ſe uti momenta ponderis P,
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adeoque erit hoc ſolidum Parabolicum ubivis æqualis Cohærentiæ.</
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C F B E: </
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">ſi ideo in ſuperficie ſuperiori F G B oneretur æquabiliter
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pondere, erit id pondus ſupra F B ad pondus ſupra G B, uti eſt F B
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ad G B, hoc eſt uti Cohærentia baſeos C F ad eam baſeos G E.</
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<
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">Data Conoide Cubica parabolica A B C,
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ejuſque dato ſegmento D B E, una cum appenſo pondere P maximo,
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quod geri poteſt ex D B E, invenire pondus ex vertice E Conoidis
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A B C ſuſpendendum, quod ad ſuam Cobærentiam eandem bæbeat
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rationem ac pondus P cum gravitate D B E ad ſuam.</
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">Quantitatibus deſignatis ut in Propoſitione LXIX, erit momen-
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tum ex gravitate Parabolæ D B E una cum momento ponderis P
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= {9aacd
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/80r
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} + {ad
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p/r
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}. </
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. </
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gravitate parabolæ A B C = {9/80} aacr & </
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ſiti = a x. </
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tio, {9aacd
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/80r
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} + {ad
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p/r
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}, d
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:</
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. </
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pondus quæſitum x = {9/80} {acd
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/r
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} + P - {9/80} acr.</
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cum pondere P appenſo, ſummo quod geſtari poteſt, producere Co-
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noidem, ita ut producta A B C momento ſuæ gravitatis babeat </
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