Gravesande, Willem Jacob 's
,
Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1
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MATHEMATICA. LIB. I. CAP. XXI.
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eo ſi hæc dicatur 2R, erit IL = {AI
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/2R} = {Bi
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/2R}:</
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/2AF} ſe habet ad {Bi
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/2R},
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ut {
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/AF} ad{N
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/R}; </
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IL, AB:</
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xml:space
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/R} {
<
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/AF}</
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<
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">Sed ut vidimus AB, I i:</
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">ergo ex compoſitione rationis
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IL, I i:</
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x
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/R}, {
<
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<
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x
<
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/AF} = {
<
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-N
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</
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x
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/AF} :</
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/R}, {M
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-N
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/AF}
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Eodem tempore percurruntur IL & </
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">i I, prima vi qua corpus retinetur in
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Ellipſi quieſcente, ſecunda difterentiâ vis hujus cum vi qua corpus in El-
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lipſi mobili retinetur, ergo vis in Ellipſi ad differentiam hanc, ut {N
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/R}
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ad {M
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-N
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/AF} .</
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} vis qua corpus in Ellipſi retinetur in puncto A, & </
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{N
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/R}, {M
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-N
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/AF} :</
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/AF
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}, ad differentiam virium {RMM-RNN/AF
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}</
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">Si agatur de diſtantia alia quæcunque quæ dicatur D, vis qua corpus reti-
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netur in Ellipſi hac analogia detegitur
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{I/AF
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}, {I/D
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} :</
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/AF
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} ad vim quæſitam {NN/DD}.</
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<
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">Difterentia virium detegitur hac regulâ
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{I/AF
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}, {I/D
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} :</
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} ad differentiam quæſitam
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{RMM-RNN/D
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}.</
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">Idcirco vis integra qua corpus in Ellipſi mobili retinetur ſequitur propor-
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tionem {NN/D
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} + {RMM-RNN/D
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}, quando corpus & </
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partem tendunt. </
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{NN/D
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}-{RMM - RNN/D
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}.</
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