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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pondus ductum in 144. </
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ſed in Experimento CCXXXIV. </
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<
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xml:space
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11 pollices fractum fuit a libris 54: </
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<
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gitudinis = 121, dant 6534. </
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<
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xml:space
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</
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<
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gitudinis per vim reſiſtentiæ 68 dat 9792. </
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">& </
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<
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CCXXXVIII productum quadrati longitudinis per libras 80 dat
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9680, qui numeri iterum ſunt ſibi propinqui: </
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<
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xml:space
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CCXXXIX parallelopipedum Piceæ 12 pollic. </
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<
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fuit a libris 79. </
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<
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11376. </
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<
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xml:space
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">idem modo 10 pollices longum fractumque a libris 83, dat
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pro producto ex quadrato longitudinis per reſiſtentiam 8300, ubi
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aberratio eſt notabilis, an hæc in Picea ſemper erit, an vero alii
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proportioni auſcultabit, nondum mihi conſtat, id ex pluribus Ex-
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perimentis deducendum foret. </
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quare hæc ligna reſiſtant in ratione inverſa duplicata longitudinum,
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quam nondum eruere potui.</
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diverſa, preſſa ſecundum longitudinem, exercent vires reſiſtentiæ,
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quæ ſuni in ratione inverſa duplicata longitudinum, in ratione
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ſimplici craſſitiei lateris, quod non inflectitur, & </
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plicata craſſitiei lateris, quod inflectitur.</
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CCXXV: </
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<
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18 pollices longum, cujus ſingula latera erant 0, 23 pollic. </
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libras 23. </
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gum, cujus ſingula latera ſunt 0, 35 pollic. </
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<
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igitur pateat Propoſitio, primum quæramus quantum reſiſtentiæ
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habuiſſet parallelopipedum Experimenti CCXXII, ſi non fuiſſet
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18 pollic. </
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Experimento CCXXV. </
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tem reſiſtentia ejuſdem parallelopipedi eſt in ratione duplicata in-
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verſa longitudinis, erit 144, quadratum longitudinis 12 pollic.</
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