Huygens, Christiaan
,
Christiani Hugenii opera varia; Bd. 1: Opera mechanica
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DE USU HOROLOG.
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dius ex adverſo 2 filorum conſpicitur. </
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<
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xml:space
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obſervatio rurſus eodem modo eſt inſtituenda, ubi ſol ex
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adverſo filorum cernitur, & </
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<
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ta & </
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<
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">ſecunda horologiorum, quibus adde æquationem ejus
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diei excerptam ex Tabulâ, & </
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<
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nat 12 horas Horologium ad rectam menſuram accommoda-
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tum eſt. </
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<
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xml:space
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">Si vero differat dividenda ſunt minuta & </
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<
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iſtius differentiæ, per numerum dierum inter utramque ob-
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ſervationem, ad obtinendam quotidianam differentiam.</
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<
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</
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<
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<
s
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xml:space
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">Supponamus hanc ſecundam obſervationem fieri 30. </
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<
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tii ſcil. </
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<
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">octo diebus poſt primam & </
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<
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ſolis viſa in meridiano ex adverſo 2. </
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<
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h. # m. # ſ.
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11. # 51. # 7.
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0. # 10. # 40.
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12. # 1. # 47.
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horologium indicare
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Æquatio 30. </
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præbet ſummam</
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<
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<
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xml:space
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">Si hæc ſumma exacte fuiſſet 12 horarum, horologium re-
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cte dispoſitum fuiſſet, ſed cum excedat 12. </
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<
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</
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<
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xml:space
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">ſecundis, tanto citius promotum fuit ſpatio octidui; </
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hoc 1 minutum & </
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">47 ſecunda, aut 107 ſecunda, diviſa per
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8. </
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">{3/8} ſecundorum, differentiam in ſpatio 24. </
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<
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rum. </
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<
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">Quâ differentià cognitâ, ſi non otium nec animus ſit
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ſuſcipiendi moleſtiam ut adaptetur horologium ad veram men-
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ſuram, neceſſe hoc non eſt; </
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<
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xml:space
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">ita enim in navim inferre licet,
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modo prædicta quotidiana differentia annotetur, & </
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<
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nosmet componamus ut ſtatim dicetur.</
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<
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xml:space
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">Sed ſi accuratius Horologium diſponere velimus, removen-
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dum eſt minus pondus penduli parumper deorſum, quo tardius
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movebitur: </
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<
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xml:space
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">& </
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<
s
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">tum de novo obſervatio per ſolem inſtituenda
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eſt ut antea; </
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>
<
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">ſi tarde nimis motum fuiſſet, ſupra memora-
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tum pondus parumper ſurſum promovendum fuiſſet,
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ita tamen, ne ſupra punctum medium penduli promoveatur.
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</
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<
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">eâ quippe gaudet proprietate, quod inde ſurſum promotum
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horologium lentius iterum promoveat, cujus rei in deſcri-
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ptione Horologii datur demonſtratio ; </
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<
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<
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pra pag 172.</
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poris, cujus ſolummodo hic docemus uſum. </
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