Huygens, Christiaan
,
Christiani Hugenii opera varia; Bd. 1: Opera mechanica
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CHRISTIANI HUGENII
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qualem diximus per tangentes cycloidis V S, M T &</
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.</
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go, ſicut ſe habent omnes ſimul priores ad omnes eas ad
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quas ipſæ referuntur, hoc eſt, ſicut tota F G ad tangentes
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omnes Χ Δ, Γ Σ, &</
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<
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<
s
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">ita tempus quo percurritur tota B I
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cum celeritate dimidia ex Β Θ, ad tempora omnia motuum
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quales diximus per tangentes cycloidis V S, M T, &</
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<
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<
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xml:space
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">Prop. 2.
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Archimedis
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de Sphæ-
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roid. &
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Conoid.</
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Et invertendo itaque, tempora motuum dictorum per tan-
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gentes cycloidis, ad tempus per rectam B I cum celeritate
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dimidia ex B Θ, eandem rationem habebunt quam dictæ tan-
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gentes omnes circumferentiæ F H ad rectam F G; </
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<
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norem proinde quam arcus F O ad rectam eandem F G;
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</
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<
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xml:space
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">quia arcus F Φ, ideoque omnino & </
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">arcus F O major eſt
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dictis omnibus arcus F H tangentibus . </
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<
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xml:space
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huj.</
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B E poſt N B, ad tempus per B I cum celeritate dimidia ex
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B Θ, poſuimus eſſe ut arcus F O ad rectam F G. </
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<
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">Ergo
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dicta tempora omnia per tangentes cycloidis minora ſimul
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erunt tempore per B E poſt N B, cum antea majora eſſe os-
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tenſum ſit; </
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<
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">quod eſt abſurdum. </
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">Itaque tempus per arcum
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cycloidis B E, ad tempus per tangentem B I, cum celerita-
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te dimidia ex Β Θ vel ex F A, non habet majorem rationem
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quam arcus circumferentiæ F H ad rectam F G.</
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<
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">Habeat jam, ſi poteſt, minorem. </
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<
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">Ergo tempus aliquod
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majus tempore per arcum B E, (ſit hoc tempus Z) erit ad
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tempus dictum per B I, ut arcus F H ad rectam F G.</
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<
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">Quod ſi jam ſumatur arcus N M æqualis altitudine cum
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Fig. 2.</
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arcu B E, ſed cujus terminus ſuperior N ſit humilior puncto
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B, erit tempus per arcum N M majus tempore per arcum
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BE . </
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<
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xml:space
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">Manifeſtum autem quod punctum N tam
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xml:space
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">Prop. 22.
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huj.</
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ſumi poteſt puncto B, ut differentia dictorum temporum ſit
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quamlibet exigua, ac proinde minor ea qua tempus Z ſupe-
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rat tempus per arcum B E. </
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<
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ptum. </
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<
s
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">Unde quidem tempus per N M minus erit tempore Z,
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habebitque proinde ad dictum tempus per B I, cum dimi-
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dia celeritate ex Β Θ, minorem rationem quam arcus F H ad
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rectam F G. </
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<
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</
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<
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