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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poſſet transferri, ſi ſingulæ ſolæ agerent & </
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xml:space
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">107.</
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cum punctum quieſcat, integras ſuas actiones ambæ ſimul in
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hoc exerunt, & </
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pore moveri; </
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<
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xml:space
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">ſi autem per ambas ſimul transferatur dabitur in
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b, in diagonali Ab, ductis eb ad Ad, & </
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babus ergo potentiis conatur lineam Ab percurrer@ eo tempo-
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re, quo poſſet percurrere Ae aut Ad; </
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<
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ratæ potentiæ adunicam per Ab agentem reducuntur, & </
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hæc potentia ad reliquas duas ut Ab ad Ad & </
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id eſt, ut AB ad AD & </
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potentia, qua punctum A trahitur per AB, poten-
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tiæ, ad quam reliquæ duæ reducuntur, & </
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trarie agit.</
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<
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">Nota eſt triangulorum proprietas, latera eſſe inter ſe ut
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ſinus angulorum oppoſitorum; </
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tentiæ tres, quæ ſunt inter ſe ut ſinus angulorum directioni-
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bus potentiarum oppoſitarum formatorum. </
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tia quæ per
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E agit, eſt ut ſinus anguli BAD, & </
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cæteris.</
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">Qua demonſtrantur quæ ſpectant punctum quod filis ad
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partes diverſas trabitur.</
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<
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">Machina hæc conſtat ex orbe ligneo, diametri circiter o-
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cto pollicum, horizontalis eſt & </
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fig. 2.</
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craſſitiei ſulco circumdatur, quo Trochleæ ad libitum, in
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quocunque circumferentiæ puncto, Machinæ junguntur.
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pendiculariter cohæret, ut in Frepræſentatur.</
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<
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">Orbis prædictus in ſuperiori parte paululum excavatur,
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ut recipiat orbem minorem
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, craſſitiei quartæ partis u-
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nius pollicis, & </
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tem; </
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">ita ut filum ſuper Trochleâ, ut dictum, Machinæ an-
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nexâ, horizontaliter extenſum ſuperficiem
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F perſtrin-
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gat.</
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<
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minores. </
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