Vitruvius Pollio, I dieci libri dell?architettura, 1567

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                <p type="main">
                  <s id="s.007791">
                    <pb pagenum="422" xlink:href="045/01/436.jpg"/>
                    <emph type="italics"/>
                  gire la confuſione, egli ſi farà la figura ſegnata B. </s>
                  <s id="s.007792">Sia adunque fatio il circolo o p q n. che
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                  rappreſenti il Meridiano, & ſia partito in quattro quarte per due diametri o n. & p
                    <expan abbr="q.">que</expan>
                  ſia
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                  preſo nel diametro p
                    <expan abbr="q.">que</expan>
                  la lunghezza del Gnomone, che uuoi dal punto e. al punto t. sì di
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                  ſotto come di ſopra. </s>
                  <s id="s.007793">& paßino per li punti t. linee egualmente diſtanti al diametro o n. che
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                  ſiano r t ſ. </s>
                  <s id="s.007794">queſte ſerueno per li piani, ſopra li quali ſi ſtendeno le ombre. </s>
                  <s id="s.007795">per ponere adunque le
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                  lunghezze delle ombre d'hora in hora ſopra i detti piani, piglierai dalla figura A. le circonfe­
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                  renze ſepartite delle hore, & le riporterai nella figura B. quelle del tropico del Cancro nella
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                  quarta n p. dal punto n. & quelle del tropico del Capricorno nella quarta n
                    <expan abbr="q.">que</expan>
                  dal punto
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                  n. & noterai i numeri delle hore riſpondenti, da i quali tirerai le linee per lo centro e. fin al pia
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                  no oppoſto r t ſ. </s>
                  <s id="s.007796">doue quelle del Cancro ſaranno ſegnate ſopra la linea r ſ t. di ſotto, &
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                  quelle del Capricorno nella linea r ſ t. di ſopra il diametro o e n. </s>
                  <s id="s.007797">Volendo poi fare l'horolo
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                  gio, che guarda a Leuante, farai il circolo ſegnato C. che ſia a b c d. nel centro e. & i dia
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                  metri ſiano a c. commune taglio di eſſo Meridiano, & dell'Orizonte, & b d. commune ta
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                  glio di eſſo Meridiano, & del uerticale, ſi che il punto a. ſia uolto al mezo dì, & il punto c.
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                  at Settentrione. </s>
                  <s id="s.007798">dapoi ſia tirato un'altro diametro tra la quarta a d. che ſia f g. commune
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                  taglio dello equinottiale, & del Meridiano. </s>
                  <s id="s.007799">il qual diametro ſia tanto alto ſopra il punto a.
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                  quanto l'equinottiale poſto nello Analemma ſopra l'Orizonte. </s>
                  <s id="s.007800">In queſta figura ſegnata C. tu
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                  dei riportare gli archi ouero le circonferenze Meridiane, & prima quelle del tropico del Capri­
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                  corno a o. a i. a l. a u. a r. dal punto a. della figura C. nella circonferenza a f.
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                  & notare o i l u n. & poi quelle del tropico del Cancro c o. c i. c l. c u. c r. dal
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                  punto c. uerſo il punto d. & notare i numeri delle hore corriſpondenti, & tutto queſto farai
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                  con lettere, & linee, che ſi poſſino leuare. </s>
                  <s id="s.007801">Iſpedite queſte diuiſioni nella figura C. tirerai le li­
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                  nee dalli punti o. i. l. u. r. che paſſino per lo centro e. nella parte oppoſta, sì quelle del Can
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                  cro, come quelle del Capricorno. </s>
                  <s id="s.007802">& piglierai le lunghezze delle ombre dalla figura B. & le ri­
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                  porterai n ella figura C. dal centro e. nelle linee corriſpondenti alle hore, che uuoi traportare:
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                  a queſto modo farai l'horologio tirando da i punti del tropico del Cancro a i punti del tropico del
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                  Capricorno le linee delle hore, che taglieranno il diametro f g. ne i luoghi ſuoi come uedi nella
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                  figura C. </s>
                  <s id="s.007803">Con la iſteſſa ragione ſi fanno gli horologi nel piano Meridiano uolto a Ponente, ma
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                  traportando il tutto nella quarta a b. & ſegnando le hore dopo il mezo dì, che ſono
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                  11. 10.
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                  9. 8. 7.
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                  come nella figura D. ſi puo uedere.
                    <emph.end type="italics"/>
                  </s>
                </p>
                <p type="main">
                  <s id="s.007804">
                    <emph type="italics"/>
                  A. </s>
                  <s id="s.007805">Analemma per gli horologij che riguardano a Leuante, ouero a Ponente, donde ſi caua
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                  la latitudine.
                    <emph.end type="italics"/>
                  </s>
                </p>
                <p type="main">
                  <s id="s.007806">
                    <emph type="italics"/>
                  B. come ſi cauano le altezze del Sole per cauare le lunghezze dell'ombre.
                    <emph.end type="italics"/>
                  </s>
                </p>
                <p type="main">
                  <s id="s.007807">
                    <emph type="italics"/>
                  C. horologio da leuante con le hore de gli antichi.
                    <emph.end type="italics"/>
                  </s>
                </p>
                <p type="main">
                  <s id="s.007808">
                    <emph type="italics"/>
                  D. horologio occidentale con le hore de gli antichi.
                    <emph.end type="italics"/>
                  </s>
                </p>
                <p type="main">
                  <s id="s.007809">
                    <emph type="italics"/>
                  E. horologio dall'Oriente con le hore dal mezo dì.
                    <emph.end type="italics"/>
                  </s>
                </p>
                <p type="main">
                  <s id="s.007810">
                    <emph type="italics"/>
                  F. horologio occidentale, con le hore dal mezo dì.
                    <emph.end type="italics"/>
                  </s>
                </p>
                <p type="main">
                  <s id="s.007811">
                    <emph type="italics"/>
                  G. horologio occidentale con le hore dopo'l mezo dì.
                    <emph.end type="italics"/>
                  </s>
                </p>
                <p type="main">
                  <s id="s.007812">
                    <emph type="italics"/>
                  H. horologio Orientale dalle hore dell'occaſo inanzi mezo dì.
                    <emph.end type="italics"/>
                  </s>
                </p>
              </subchap2>
            </subchap1>
          </chap>
        </body>
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    </archimedes>
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