Gravesande, Willem Jacob 's
,
Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1
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PHYSICES ELEMENTA
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<
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<
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xml:space
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">Ut exactiſſimè experimenta inſtituantur, minora trian-
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gula rectangula chartacea, aut potius lignea, ſunt adhiben-
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da, & </
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acte longitudo plani cum altitudine conferatur.</
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<
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8.</
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chinâ. </
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<
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xml:space
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fig. 6.</
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potentiâ trahente per MS; </
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rizontem perpendicularis, & </
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normalis: </
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<
s
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">in omni caſu ubi pondus P eſt ad pondus corpo-
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ris M, ut MS ad
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, corpus quieſcit.</
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<
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">Pondere ſuo corpus M trahitur juxta directionem RM,
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plano inclinato ſuſtinetur directione ad planum perpendicu-
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lari, & </
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<
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<
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<
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9.</
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CB brachia ſunt æqualia, & </
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ita ut ſi
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C continuetur verſus D, & </
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fig. 7.</
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dicularis ducatur, DC ſit dimidia pars ipſius BC aut CA.
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pondere p unius libræ, & </
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<
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">in B pondere P
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duarum librarum, poſitoque brachio
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in ſitu horizonta-
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li, datur æquilibrium ; </
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<
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xml:space
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recto in puncto D eſſet ſuſpenſum .</
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fig. 8.</
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vero imponatur brachio BC in B; </
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ſus impediatur, dabitur iterum æquilibrium.</
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ventur: </
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E in directione ad brachium BC perpendiculari; </
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ne plani verticalis premitur corpus illud horizontaliter; </
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tandem vi gravitatis verticaliter pellitur. </
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tentiis trahitur pondus p, quæ ſunt inter ſe ut latera trian-
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guli
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D ; </
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<
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ſe habet ad vim trahentem E verſus (pondus P), ut BD ad BE,
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aut DC ad CB , ſeu
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; </
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<
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etiam eſt ratio inter pondera p & </
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