Huygens, Christiaan
,
Christiani Hugenii opera varia; Bd. 1: Opera mechanica
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HOROLOG. OSCILLATOR.
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larum ſolidi A B C D à plano E C, ad ſummam quadrato-
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rum, à diſtantiis omnium particularum cylindri vel prisma-
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tis B D S S ab eodem plano, rationem eam quæ componi-
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tur ex ratione numeri particularum ſolidi A B C D, ad nu-
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merum particularum cylindri vel prismatis B D S S, & </
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ratione ſpatii Z ad rectangulum B C K: </
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<
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quam habet rectangulum Z, multiplex per numerum parti-
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cularum ſolidi A B C D, ad rectangulum B C K, multi-
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plex per numerum particularum cylindri vel prismatis B D S S.
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<
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">Atqui quarta harum magnitudinum æqualis eſt ſecundæ
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nempe rectangulum B C K, multiplex per numerum parti-
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cularum cylindri vel prismatis B D S S, æquale ſummæ
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quadratorum, à diſtantiis particularum ejusdem prismatis
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vel cylindri B D S S à plano E C; </
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<
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idem B C K, multiplex per numerum particularum ſegmen-
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ti B N N D, æquatur quadratis diſtantiarum particularum
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ejusdem ſegmenti à plano E C . </
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<
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huj.</
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quabitur; </
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<
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cularum ſolidi A B C D, ſummæ quadratorum, à diſtantiis
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particularum ſolidi ejusdem A B C D à plano E C . </
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lib. 5. Eucl.</
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erat demonſtrandum.</
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<
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">Notandum vero, quando ſolidum A B D rotundum eſt
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circa axem A C, fieri ſemper rectangulum B C K æquale
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quartæ parti quadrati B C; </
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">quoniam ſubcentrica cunei, ab-
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ſciſſi ſuper circulo B D, plano per tangentem in B, nempe
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recta B K, æquatur {5/4} radii B C. </
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">Unde, ſi P V æqualis
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poſita ſit B C, ſequitur, faciendo ut Ρ Δ ad Ρ Φ ita rectan-
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gulum B C K, hoc eſt, {1/4} quadrati B C, hoc eſt, qu. </
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ad planum aliud Z, fore hoc rectangulo Δ Ρ Φ æquale. </
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proinde tunc ipſum rectangulum Δ Ρ Φ, multiplex ſecun-
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dum numerum particularum ſolidi A B D, æquari ſummæ
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quæſitæ quadratorum à perpendicularibus omnibus, quæ à
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particulis iisdem cadunt in planum E C.</
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