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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dinem A D, dabit momentum oriundum ex gravitate = {b b c x
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.</
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ſupponatur hic cylindrus ad Cohærentiam ſuam in eadem ratione
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f ad d. </
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">erit Cohærentia hujus 8x
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. </
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<
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xml:space
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/4 a
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} 8x
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:</
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<
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xml:space
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<
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xml:space
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:</
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xml:space
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">: {1/4} a c b b + p b a
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. </
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<
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">mediisperſe, fit {a
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b b c x
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/4a
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}
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= {1/2} a c b b x
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+ 8 p b x
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. </
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<
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xml:space
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">factaque diviſione per {b b c x
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,/4a a} manet x
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<
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=2a
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+ 3 {2 a a p.</
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">/b c} unde x =
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2 a
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+ 32{a a p.</
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<
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">/b c} quo cognito valore
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radii baſeos A B. </
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<
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">Dato Cylindro A B C D, cujus momentum
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gravitatis ad Cohærentiam habeat rationem datam f ad, d: </
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que ab ipſo quolibet fruſto Q D, reperire pondus extremo Q ap-
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pendendum, cujus momentum, unà cum momento ex gravitate re-
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liquæ partis A B Q, ad Cohærentiam ſit in eâdem ratione f ad, d.</
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</
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<
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<
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">Ponatur {1/2} A B = r. </
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<
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">circumferentia baſeos = c. </
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<
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</
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<
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xml:space
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">erit baſis = {1/2} c r. </
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<
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">& </
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<
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xml:space
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">ſoliditas cylindri A B C D = {1/2} b c r. </
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oriundum ex gravitate = {1/4} b b c r. </
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eſt uti cubus A B = 8 r
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. </
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<
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">quare datur {1/4} b b c r. </
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:</
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<
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<
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">Abſcindatur a cylindro ſegmentum Q D, ita ut maneat A Q
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= l. </
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<
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xml:space
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">erit ſoliditas cylindri A B Q = {1/2} c r l, & </
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<
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vitate = {1/4} c r l l. </
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<
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<
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ſpendendum ab extremo Q habebit momentum = l x. </
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<
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ma momenti ponderis & </
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<
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ad Cohærentiam baſeos 8r
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<
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<
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<
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</
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<
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<
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<
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">Sed poteſt dari generalior demonſtratio, quæ non modo Cylin-
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dris, ſed Parallelopipedis, Conis, aliisque corporibus regularibus
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applicari poteſt: </
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