Huygens, Christiaan
,
Christiani Hugenii opera varia; Bd. 1: Opera mechanica
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CHRISTIANI HUGENII
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<
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xml:space
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">Jam poſtquam utrovis modo eorum quos diximus, ſed
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.</
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priore potius, examen inſtitutum fuerit, ſi multum aberra-
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re à media dierum longitudine horologium reperiatur, adeo
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ut differentia ultra tria quatuorve prima ſcrupula aſcendat,
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remedium adhibebitur aucta aut diminuta ipſius penduli longi-
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tudine. </
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xml:space
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">Ubi hæc tenenda eſt regula, tot ſcrupulis primis,
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in ſingulos dies, motum horologii acceleratum aut retarda-
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tum iri, quot {7/10} unius lineæ auferentur pendulo aut adden-
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tur. </
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<
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xml:space
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">Cumque ad veram menſuram hoc pacto jam prope re-
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">TAB. II.
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Fig. I.</
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ductum erit, reliqua correctio transpoſitione exigui ponde-
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ris Δ, virgæ V V adhærentis, commode peragetur. </
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pondus lentis formam habet, cujus ſectionem ſecundum
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axem in figura 1. </
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<
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">Et quia tantum viceſimam
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triceſimamve, aut etiam minorem, partem æquat ponderis
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X, hinc fit ut ſat magnis ſpatiis è priore loco diſcedens,
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haud multum tamen perpendiculi motum afficiat, acceleran-
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do nempe quoties verſus mediam virgæ longitudinem attra-
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hitur, retardando cum inde ſurſum aut deorſum movetur.
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</
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<
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">Ne vero diu punctum illud quærendum ſit quo veriſſimam
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daturum ſit dierum menſuram, diviſimus certa ratione, ex
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motus legibus petita, inferiorem virgæ medietatem, poſito
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nimirum pondere Δ parte quinquageſima ponderis X, pari-
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que gravitate ipſius virgæ V V. </
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">Quæ quidem diviſiones fi-
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">TAB. II.
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Fig. 4.</
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gura 4 exhibentur, ubi penduli portio inferior in tres partes
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ſecta cernitur, quarum, quæ infimo loco ponenda, eſt A B.
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">Punctum A eſt centrum gravitatis ponderis X, à puncto
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autem C, centro oſcillationis, partes ſingulæ, quindecim
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ſcrupulorum ſecundorum differentiam diurnam efficiunt, ubi
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tali intervallo mota fuerit lens Δ. </
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ſionumque inventio, dabitur in iis quæ de Centro Oſcilla-
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tionis.</
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<
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xml:space
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">Cæterum illorum quoque quæ mari vehuntur, longitu-
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dinum inveſtigandarum gratiâ, formam hic deſcriberemus,
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ſi quænam maxime ad hunc uſum accommodata ſit, æque
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ac in præcedentibus, exploratum determinatumque habere-
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mus; </
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<
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