Vitruvius
,
De architectura libri decem
,
1567
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illa, quæ fit aquæ ducendægratia. </
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<
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xml:space
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">quòd ſi locus ad millæ paſſus ſex pedes declinauerit, rapidus aquæ curſus
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fiet ita, ut nauibus ſit incommodus, & </
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<
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<
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xml:space
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">Declinationem, & </
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">deuexit atem aluei pila in ſulcum immiſſa
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<
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probant imperiti, quæ ſi decurrat, decliuem locum eſſe arbitrantur.
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<
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xml:space
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">Cæterum alia ratio eſt peritorum, nam ijs utuntur instrumentis, quæ Vi-
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tru. </
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<
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xml:space
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">connumerauit, quæ omnia angulo recto finiuntur, ſed alterum alte-
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ro certius eſt. </
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<
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xml:space
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">Quamuis uero ſecretioris indaginis ars librandi ſit, quàm
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modo explicare poßim, tamen nonprætermittam quæ ad uſum ſpectabüt. </
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<
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<
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Locus quo ducenda est aqua, aut intuitu ab aquæ capite cernetur, aut in-
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tercipietur montium, uel ædificiorum obiectu. </
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>
<
s
xml:id
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xml:space
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">Siintueri eum poſſumus,
<
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aut planum, per quod ducenda est aqua, æquabiliter ſe habebit, aut in tu
<
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/>
mulos inſurget, utriuſque reiratio habenda eſt, in libramento montis,
<
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/>
uel rupis, uel ædificij; </
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>
<
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xml:id
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xml:space
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">quod poſtea explicabo. </
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>
<
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xml:space
="
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">Siuero cerni non poteſt,
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/>
obiectu aliquo, tunc tetrante cum dioptris utimur hoc modo. </
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>
<
s
xml:id
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xml:space
="
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">Pone ad ca
<
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/>
put aquæ, ſi fons fuerit, uel ad incile tetrantem, ita ut perpendiculum ad
<
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/>
lineam lateris eius, quod in horizontem cadit, præciſe æquatũ cadat, per
<
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/>
pinnulas, aut dioptram proſpice, & </
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>
<
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xml:id
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xml:space
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">locũ aliquem ſignato in monte, aut
<
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in rupe obiecta, qui fontis capitipari libramento reſpondeat. </
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>
<
s
xml:id
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xml:space
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">ad eum lo-
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cum poſtea accede, & </
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>
<
s
xml:id
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xml:space
="
preserve
">eodem modo collocato tetrante alium locum quæ-
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ras, ad quem aſpiciendo per pinnulas, ſignum aliud æque libratũ faciis,
<
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/>
ita enim a paribus libramentis ad diuerſa loca accedes, donec te conſti-
<
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/>
tuas in eo loco, a quo proſpicere, & </
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>
<
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xml:id
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xml:space
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">intueri poßis locum, ad quem ducen
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dam aquam ſumpſeris. </
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>
<
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xml:id
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xml:space
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">Poſito igitur tetrante eo modo, quo ſupra per pin
<
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/>
nulas, uideto locum, ad quem ducere aquam uoles. </
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>
<
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xml:id
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xml:space
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">Quod ſi perpendicu-
<
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/>
lum filo appenſum eidem lineæ, cui prius, adiaceat, ſcito a capite fontis
<
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/>
ad emiſſarium (ita enim locum uoco, ad quem ducenda est aqua ). </
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>
<
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xml:space
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">æqui-
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/>
libratatam eſſe altitudinem. </
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>
<
s
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xml:space
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">Quod ſi filum intra tetrantem incidat, de-
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preſſius erit emiſſarium, quam fons, uel incile, & </
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>
<
s
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xml:space
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">aqua commode perdu-
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cetur. </
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>
<
s
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xml:space
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">Si uero extra tetrantem linea perpendiculi cadat, ſcito aquam nõ
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poſſe duci, quoniam altius erit emiſſarium, aqua uero ultra originem
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ſuam urgeri, & </
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>
<
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">cogi non poteſt, ideſt ſua ſponte altius origine ſua non ex-
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urget. </
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>
<
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xml:space
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">Quod autem dixi, ſuperiori deſcriptione erit apertum. </
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<
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fontis eſt caput, B C. </
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<
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">prima inſpectio. </
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quæ plana eſt, licet uideatur in deſcriptione aſcendere D. </
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<
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">e. </
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<
s
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ſpectio a qua non potest aqua perduci, quoniam ſignum e. </
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<
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gno D. </
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<
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<
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">quarta inſpectio eſt, & </
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<
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<
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poteſt, quoniam f. </
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<
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xml:id
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<
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">depreſſius d. </
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<
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">igitur b. </
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<
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<
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<
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xml:id
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aquæ perductio. </
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>
<
s
xml:id
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xml:space
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">Quando igitur emiſſarium a fonte uideri non potest, ita
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librandum eſt. </
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>
<
s
xml:id
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xml:space
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">Siuero uterque terminus uidebitur, aut modicis, inter-
<
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uallis in librando ſigna ponimus, aut longioribus, ſimodicis certè fiet,
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/>
ut minus a flexo terræ ambitu directio abſcedat. </
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>
<
s
xml:id
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xml:space
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">Quo autem ſpatia fue-
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rint maiora eo circumflexu terræ a recta libræ linea decliuius eſſe inue-
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nietur. </
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>
<
s
xml:id
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xml:space
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">quare in his obſeruandum eſt, ut in octonos ſtadios, decem ad mi-
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nus digitos declines. </
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>
<
s
xml:id
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xml:space
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">Si uero ſolum non omnino æquabile fuerit, ſed inter-
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ſurget terræ tumulus, tunc oportebit terræ altitudinem ut primum a ca-
<
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pite, & </
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>
<
s
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xml:space
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">ab incili, poſtea ab emiſſario, & </
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>
<
s
xml:id
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xml:space
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">termino metiaris, ita enim cer-
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tior fies, quantum inſurget terra interpoſita, nam ſi libella aut nor-
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ma utaris duplicem lineam conſiderabis, alteram, quam radium appello ab oculo ſpectantis ductum ad
<
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/>
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