Vitruvius Pollio, I dieci libri dell?architettura, 1567

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                <pb pagenum="252" xlink:href="045/01/263.jpg"/>
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                  <s id="s.004904">
                    <emph type="italics"/>
                  Del tetto del portico del Theatro.
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                  </s>
                </p>
                <p type="head">
                  <s id="s.004905">
                    <emph type="italics"/>
                  Cap. VII.
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                <p type="main">
                  <s id="s.004906">IL tetto di quel portico del Theatro, che ſta ſopra l'ultimo ordine de i gradi ſu
                    <lb/>
                  periori ſi fa ad egual liuello dell'altezza della ſcena: & la ragione è, perche la
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                  uoce creſcendo egualmente peruenirà, & al ſommo ordine de i gradi, & al
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                  tetto; perche ſel portico non ſarà eguale all'altezza della ſcena, quanto meno
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                  egli ſarà alto, la uoce ſarà portata inanzi a quella altezza, alla quale prima peruenirà. </s>
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                <p type="main">
                  <s id="s.004907">
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                  Io ho detto, che queſto portico era ſopra i gradi, & come un corridore aperto uerſo il piano
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                  del Theatro, ma ſerrato di dietro faceua riſuonare la uote mirabilmente. </s>
                  <s id="s.004908">Leon Battiſta lo chia
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                  ma circonuallatione, & dice, che era fatto per reſtrignere, & unire la uoce, & che ſopra, co­
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                  me per cielo del Theatro, & per la uoce, & per l'ombra ſi tiraua una uela ornata di ſtelle. </s>
                  <s id="s.004909">Que
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                  ſto portico era fatto molto maeſtreuolmente, perche haueua ſotto altri colonnati, & altri porti­
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                  chi per ſoſtenimento di quelli di ſopra, ma aperti nella parte eſteriore; & queſto ſi faceua ne i
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                  Theatri di molta grandezza: & ſi faceuano doppi, perche al tempo delle pioggie, le genti ſi po­
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                  teſſero meglio riparare. </s>
                  <s id="s.004910">I colonnati loro erano di opra ſoda, & ferma, & i loro lineamenti era
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                  no cauati dalla ragione de gli archi, de i quali il ſopradetto ne ragiona copioſamente.
                    <emph.end type="italics"/>
                  </s>
                </p>
                <p type="main">
                  <s id="s.004911">La Orcheſtra tra i gradi inferiori quanto grande hauerà il ſuo diametro, prendiſi la ſe­
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                  ſta parte di quello, & nelle corna, & d'intorno a gli aditi a liuello di quella miſura ſiano
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                  tagliati i ſeggi inferiori; & la doue ſarà fatto il taglio, iui ſiano poſti i ſopracigli delle
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                  uie, perche a queſto modo le loro conformationi haueranno baſteuole altezza. </s>
                </p>
                <p type="main">
                  <s id="s.004912">
                    <emph type="italics"/>
                  Il primo ordine de i gradi non era ſubito alzato da terra, percioche ſarebbe ſtato troppo baſſo,
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                  eſſendo i gradi baſſi, & eſſendo i ſedili nell'orcheſtra piu alti: però uuole Vitr. che ſi pigli la ſeſta
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                  parte del diametro dell'orcheſtra, & che quella ſia l'altezza di quel muretto, che circonda l'or
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                  cheſtra, & ſecondo quell'altezza dinanzi ſi deono tagliare i primi gradi da baſſo nelle corna, &
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                  d'intorno gli aditi, & doue ſaranno quelli tagli ſiano poſti i ſopracigli delle uie. </s>
                  <s id="s.004913">& per ſopracigli
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                  intende ſopra limitari, ſecondo, che egli ha inteſo nel quarto libro trattando de i compartimenti
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                  delle porte. </s>
                  <s id="s.004914">Erano alcune apriture, che andauano alle ſalite, & alle ſcale drizzate ſecondo iou
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                  nei, che pone Vitr. di ſopra.
                    <emph.end type="italics"/>
                  </s>
                </p>
                <p type="main">
                  <s id="s.004915">La lunghezza della ſcena ſia doppia al diametro dell'orcheſtra. </s>
                  <s id="s.004916">L'altezza del poggio
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                  dal liuello del pulpito con la ſua cornice, & gola ſia per la duodecima parte del diametro
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                  dell'orcheſtra. </s>
                  <s id="s.004917">ſopra il poggio ſiano le colonne, con i capitelli, & baſamenti la quarta
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                  parte dello iſteſſo diametro. </s>
                  <s id="s.004918">Gli architraui, & adornamenti di quelle colonne per la quin
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                  ta parte. </s>
                  <s id="s.004919">il parapetto di ſopra con la onda, & con la cornice ſia pur la metà del parapetto,
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                  o poggio di ſotto, & ſopra quel parapetto ſiano le colonne alte per un quarto meno, che
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                  le colonne di ſotto. </s>
                  <s id="s.004920">Gli architraui, & gli ornamenti di quelle colonne, per la quinta. </s>
                  <s id="s.004921">
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                  Ma ſe egli ſarà anche il terzo componimento ſopra la ſcena, ſia il parapetto di ſopra, per
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                  la metà del parapetto di mezo, & le colonne di ſopra ſiano meno alte la quarta parte del­
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                  le colonne di mezo. </s>
                  <s id="s.004922">gli architraui, & le cornici di quelle colonne habbiano ſimilmente
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                  la quinta parte dell'altezza. </s>
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                <p type="main">
                  <s id="s.004923">
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                  Dice Leon Battiſta, che le fondamenta di quelli pareti, che aſcendeno a gli ultimi gradi, &
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                  piu lontani dal centro, cioè dall'ultima, & piu larga cinta ſi deono gettare tanto lontani dal cen
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                  tro, quanto è il ſemidiametro del piano di mezo con un terzo di piu, ma i primi gradi, cioè quelli
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                  che ſono di dentro, & piu baſſi, cioè doue ſi comincia la graduatione, non deono ſubito comin­
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                  ciare dal piano, ma ne i gran Theatri ſi deue leuare un muro dal piano, o parete alto per la nona
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                  parte del ſemidiametro del piano di mezo; ma ne i Theatri minori, non ſi leuerà quel parete piu
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                  </s>
                </p>
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