Huygens, Christiaan
,
Christiani Hugenii opera varia; Bd. 1: Opera mechanica
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CHRISTIANI HUGENII
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titudinibus iſtis in ſua pondera, erit ſumma productorum
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<
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major quam {a e e y + b f f y + c g g y/x x}. </
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<
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xml:space
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">quæ proinde major quoque
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probatur quam {a d y + b d y + c d y/x}. </
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<
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xml:space
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">Nam quia poſita eſt longitudo
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x æqualis {a e e + b f f + g g/a d + b d + c d}; </
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<
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xml:space
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">erit a d x + b d x + c d x æquale
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a e e + b f f + c g g. </
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<
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xml:space
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">Et ductis omnibus in y, & </
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<
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xml:space
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do per x x, erit {a d y + b d y + c d y/x} æquale {a e e y + b f f y + c g g y/x x}. </
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<
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xml:space
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">Unde
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quod dictum eſt conſequitur. </
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<
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xml:space
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">Eſt autem ſumma iſta produ-
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ctorum æqualis ei, quod fit ducendo altitudinem, ad quam
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aſcendit centrum gravitatis commune ponderum A, B, C, in
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ſummam ipſorum ponderum, a + b + c; </
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<
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">ſi nempe ſingu-
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la, uti dictum, ſeorſim quousque poſſunt moveantur. </
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<
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xml:space
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titas vero {a d y + b d y + c d y/x} producitur ex deſcenſu centri gravi-
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tatis eorundem ponderum, (qui deſcenſus eſt R Q, ſive {d y/x},
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ut ſupra inventum fuit,) in eandem quoque ponderum ſum-
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mam a + b + c. </
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<
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">Ergo quum prius productum altero hoc
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majus oſtenſum fuerit, ſequitur aſcenſum centri gravitatis
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ponderum A, B, C, ſi, relicto pendulo ubi pervenere in
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T, V, X, ſingula celeritates acquiſitas ſurſum convertant,
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majorem fore ejusdem centri gravitatis deſcenſu, dum ex
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A, B, C, moventur in T, V, X. </
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<
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">quod eſt abſurdum, cum
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dictus aſcenſus deſcenſui æqualis eſſe debeat, per anteceden-
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tem.</
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<
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<
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">Eodem modo, ſi dicatur celeritatem puncti L, ubi per-
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venerit in P, minorem eſſe celeritate ponderis G quum in O
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pervenerit; </
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<
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">oſtendemus aſcenſum poſſibilem centri gravitatis
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ponderum A, B, C, minorem eſſe quam deſcenſum, quod
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eidem propoſitioni antecedenti repugnat. </
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<
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">Quare relinquitur
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ut eadem ſit celeritas puncti L, ad P tranſlati, quæ ponde-
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ris G in O. </
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">Unde, ut ſuperius dictum, ſequitur pendulum
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ſimplex F G compoſito ex A, B, C, iſochronum eſſe.</
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<
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libus compoſito; </
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<
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