Vitruvius
,
De architectura libri decem
,
1567
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datur in partes ſeptem, inde trium partium torus, qui eſt in ſummo, reliquæ quatuor partes diuiden-
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dæ ſunt æ qualiter, & </
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<
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">una pars fiat cum ſuis aſtragalis, & </
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<
s
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xml:space
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">ſupercilio ſuperior trochilus, altera pars in-
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feriori trochilo relinquatur, ſed inferior major apparebit, ideo quod habebit ad extremam plinthum
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proiecturam. </
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<
s
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xml:space
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">Aſtragali faciendæ ſunt octauæ partis trochili, proiectura erit ſpiræ pars octaua, & </
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tadecima craſsitudinis columnæ.</
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<
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<
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xml:space
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">A. Plinthus.
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B. Torus inferior.
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lb
/>
O. quadræ.
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lb
/>
C. Scotia.
<
lb
/>
D. torus ſuperior.
<
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E. quadra apophygis.
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F. apophygis.
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tt. craſſitudo columnæ.</
description
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<
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xml:space
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variables
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<
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<
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xml:space
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">Ionica ſpira ita deformatur, ut habeat plinthum, ſcotias duas, & </
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<
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">torum. </
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xml:space
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">Scotiæ uero, ſeu trochili duo
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ſint inter torum ſuperiorem, & </
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<
s
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xml:space
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">plinthum, ſed inter duas ſcotias, ſint aſtragali. </
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<
s
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xml:space
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">Aſtragali a forma ſic dicuntur,
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imitantur enim oſſa illa, quæ in iuncturis colli pedis ponuntur, latine tali uocantur. </
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<
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xml:space
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">Itali aſtragalos in baſi
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tondinos appellant. </
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<
s
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xml:space
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">Altitudo baſis est quemadmodum atticurgis pro dimidia columnæ craſſitudine. </
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<
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xml:space
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">latitudo
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eſt quaqua uerſus unius diametri, & </
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xml:space
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">quartæ partis, & </
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>
<
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xml:space
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">octauæ craßitudinis, columnæ. </
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>
<
s
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xml:space
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">Plinthus pro tertia
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parte altitudinis ſpiræ, reliquum in ſeptem partes diuiditur, quarum tres ſuperioritoro conceduntur, reliquæ
<
lb
/>
quatuor æquas in partes ſecantur, ex quibus una ſcotiæ, ſeu trochilo ſuperiori conceditur, & </
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<
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xml:space
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& </
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<
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xml:space
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">ſuo ſupercilio, quod eſt tanquam quadra ſuperior. </
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>
<
s
xml:id
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xml:space
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">altera pars datur inferiori trochilo. </
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>
<
s
xml:id
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xml:space
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">Aſtragali vero ex
<
lb
/>
octaua trochili parte conſtituuntur. </
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>
<
s
xml:id
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echoid-s9895
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xml:space
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preserve
">Sed uidebitur inferior trochilus maior, quia ad extremam plinthum flecti-
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lb
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tur, & </
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>
<
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xml:space
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">flexus ille amplior, maiorem ſpeciem præſefert. </
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<
s
xml:id
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xml:space
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preserve
">Nam cum duo trochili ſint animaduertendum est,
<
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note-514.01.145-04
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note-514.01.145-04a
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xml:space
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">40</
note
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ut inferioris cauum ſuperioris, ſuperiori regulæ reſpondeat. </
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<
s
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xml:space
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">trochilus ſuperior clauditur duabus regulis, qua-
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rum ſuperior appellatur ſupercilium, inferior quadra: </
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<
s
xml:id
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xml:space
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">ſupercilium unius est partis, quadra dimidiæ tantum.
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</
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<
s
xml:id
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xml:space
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">circumflectere autem trochilos oportet, quemadmodum in ſuperiori, hoc eſt Attica ſpira declaratum eſt. </
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<
s
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xml:space
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uero pauci animaduertunt, quod Vitr. </
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">dixit. </
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<
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xml:space
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">Proiectura erit ſpiræ pars octaua, & </
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">ſextadecima: </
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>
<
s
xml:id
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xml:space
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">nam loqui-
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tur hic de proiectura partis ſuperioris ſpiræ. </
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>
<
s
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xml:space
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">Aſſumitur enim columnæ craſſitudo ex qua integra primum
<
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octaua pars ſumitur, deinde ex eadem integra ſumitur ſextadecima pars, deinde utræq́; </
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<
s
xml:id
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xml:space
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">partes coniunguntur,
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& </
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<
s
xml:id
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xml:space
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">dimidium earum utrinque ponitur pro proiectura ſuperioris partis, quod æque eſt, ac ſidiceret partiendam
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eſſe columnæ diametrum in partes ſexdecim, ex quibus duæ primum, deinde una ſumenda eſt, & </
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<
s
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ponere, efficient tres ex ſexdecim partibus, quas partire, & </
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<
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<
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xml:space
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">Altuudo apo-
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phygis annuli eſt pro tertia parte tori, apopbygis eodem modo formatur, quo in Atticis dictum eſt. </
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<
s
xml:id
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xml:space
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">totius au-
<
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<
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left
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xlink:label
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note-514.01.145-05
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note-514.01.145-05a
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xml:space
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tem ſpiræ deſcriptio infra hoc loco ponitur, atque ita Ionica baſis deformatur.</
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<
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<
emph
style
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sc
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emph
>
perfectis, & </
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<
s
xml:id
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">collocatis, columnæ ſunt medianæ in pronao, & </
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<
s
xml:id
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xml:space
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">poſtico ad perpendiculum
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medij centri collocandæ. </
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<
s
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xml:space
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">Angulares autem, quæq́; </
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<
s
xml:id
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echoid-s9918
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xml:space
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">e regione earum futuræ ſunt in lateribus æ dis dex-
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tra, ac ſiniſtra, uti partes interiores, quæ ad parietes cellæ ſpectant ad perpendiculum latus habeant
<
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/>
collocatum, exteriores autem partes, (uti dictum eſt) de earum contractura. </
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<
s
xml:id
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xml:space
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compoſitionis ædium contracturæ iuſta ratione exactæ.</
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</
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<
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<
s
xml:id
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xml:space
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">Iam ad collocationem columnarum deuentum est, in qua obſeruabimus medianas columnas ad centrum
<
lb
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medium collocandas, ita ut ad perpendiculum circum circa reſpondeant. </
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>
<
s
xml:id
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xml:space
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">Angulares uero non item, ſed extra
<
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contractæ ſint, quæ uero partem interiorem reſpiciunt, rectis lineis ad perpendiculum poſitæ ſint, quod æque
<
lb
/>
est, ac ſi diceret non eſſe columnas angulares, atque etiam laterales contrahendas parte qua ad cellam ſpe-
<
lb
/>
<
note
position
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left
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xlink:label
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note-514.01.145-06
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xlink:href
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note-514.01.145-06a
"
xml:space
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">60</
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