Huygens, Christiaan, Christiani Hugenii opera varia; Bd. 1: Opera mechanica

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9963HOROLOG. OSCILLATOR.
Elevationem plani vocamus altitudinem ejus ſecundum
11De de-
SCENSU
GRAVIUM.
perpendiculum.
Fig. 4. 22Prop. 4.
huj.
ſit aſcendere per totam B C. Ideoque cadens ex F in B, ſi continuet porro motum per B C; quod repercuſſu ad ſu- perficiem obliquam fieri poteſt; aſcendet usque in C, hoc eſt, altius quam unde decidit, quod eſt abſurdum.
Eodem modo oſtendetur neque per planum A B deciden-
ti minorem velocitatem acquiri quam per C B.
Ergo per
utraque plana eadem velocitas acquiritur, quod erat demon-
ſtrandum.
Quod ſi vero, pro plano alterutro, ſumatur perpendicu-
lum ipſum planorum elevationi æquale, per quod decidere
mobile ponatur, ſic quoque eandem quam per plana incli-
nata velocitatem ei acquiri conſtat;
eadem namque eſt de-
monſtratio.
Porro hinc jam recte quoque procedet demonſtratio alte-
rius theorematis Galileani, cui reliqua omnia, quæ de de-
ſcenſu ſuper planis inclinatis tradidit, ſuperſtruuntur.
Nempe
PROPOSITIO VII.
TEmpora deſcenſuum ſuper planis diverſimode
inclinatis, ſed quorum eadem eſt elevatio, eſſe
inter ſe ut planorum longitudines.

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