Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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oritur ab attritu canalis, hic non conſidero. </
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<
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>Deſignent igitur
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AB,
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CD
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mediocrem altitudinem aquæ in crure utroque; & ubi aqua
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in crure
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KL
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aſcendit ad altitudinem
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EF,
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deſcenderit aqua in
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crure
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MN
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ad altitudinem
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GH.
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Sit autem
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P
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corpus pendulum,
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VP
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filum,
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V
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punctum ſuſpenſionis,
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SPQR
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Cyclois quam Pen
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dulum deſcribat,
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P
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ejus punctum infimum,
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PQ
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arcus altitudini
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AE
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æqualis. </
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>Vis, qua motus aquæ alternis vicibus acceleratur
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& retardatur, eſt exceſſus ponderis aquæ in alterutro crure ſupra
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pondus in altero, ideoque, ubi aqua in crure
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KL
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aſcendit ad
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EF,
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& in crure altero deſcendit ad
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GH,
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vis illa eſt pondus duplica
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tum aquæ
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EABF,
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& propterea eſt ad pondus aquæ totius ut
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AE
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ſeu
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PQ
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ad
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VP
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ſeu
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PR.
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Vis etiam, qua pondus
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P
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in
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loco quovis
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Q
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acceleratur & retardatur in Cycloide, (per Corol. </
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Prop. </
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>LI.) eſt ad ejus pondus totum, ut ejus diſtantia
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YQ
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a loco
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infimo
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P,
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ad Cycloidis longitudinem
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PR.
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Quare aquæ & pen
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duli, æqualia ſpatia
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AE, PQ
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deſcribentium, vires motrices ſunt
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ut pondera movenda; ideoque, ſi aqua & pendulum in princi
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pio quieſcunt, vires illæ movebunt eadem æqualiter tempori
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bus æqualibus, efficientque ut motu reciproco ſimul eant & re
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deant.
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Q.E.D.
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LIBER
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SECUNDUS.</
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Corol.
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1. Igitur aquæ aſcendentis & deſcendentis, ſive motus in
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tenſior ſit ſive remiſſior, vices omnes ſunt Iſochronæ. </
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Corol.
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2. Si longitudo aquæ totius in canali ſit pedum
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Pariſien
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ſium
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6 1/9: aqua tempore minuti unius ſecundi deſcendet, & tem
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pore minuti alterius ſecundi aſcendet; & ſic deinceps vicibus al
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ternis in infinitum. </
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<
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>Nam pendulum pedum (3 1/18) longitudinis,
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tempore minuti unius ſecundi oſcillatur. </
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