Vitruvius Pollio, I dieci libri dell?architettura, 1567

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                  <s id="s.007743">
                    <pb pagenum="419" xlink:href="045/01/433.jpg"/>
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                  renze Verticali, dalle quali ſi miſurano le larghezze delle'ombre. </s>
                  <s id="s.007744">& ciaſcuna riſponde alla
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                  ſua hora propria. </s>
                  <s id="s.007745">Et queſti partimenti ci ſeruiranno dapoi. </s>
                  <s id="s.007746">Ma per ſapere le dette circonfe­
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                  renze, cioè l'horaria, & la uerticale, che ci ſerueno quando il Sole è ne i tropici, o in qualche
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                  altro ſegno: farai in un'altro luogo il circolo a g b d. nel centro e. doue i diametri medeſimi ci
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                  ſerueno come nella precedente figura. </s>
                  <s id="s.007747">Siano poi tirati i diametri de i tropici t u. x y. ſopra
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                  i quali ſiano tirati i ſemicircoli come nello Analemma. </s>
                  <s id="s.007748">& fatte le diuiſioni ſecondo le ſorti delle
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                  hore, come di ſopra s' è detto, sì nelle circonferenze, come ne i diametri: Sia ſimilmente, come
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                  poco auanti tirata la linea del piano uerticale m o n. & cominciamo dal ſemicircolo del tro­
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                  pico del Capricorno x y. doue le linee delle hore antiche ſono ſegnate con i numeri loro
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                  1. 2.
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                  3. 4. 5. 6.
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                  & di ritorno
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                  7. 8. 9. 10. 11. 12.
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                  & il taglio dell'Orizonte, & del detto
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                  tropico è ſegnato t
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                  K.
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                  ſia poſto adunque l'un piede del compaſſo ſopra il punto
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                  k.
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                  & allarga­
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                  to l'altro al punto t. & la larghezza ſia riportata dal punto K. ſopra il Meridiano al punto
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                  t. ſia poi fatto centro K. & ſpatio
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                  k. 11.
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                  &
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                  1.
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                  riportato quello ſopra il Meridiano, ſtando
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                  fermo il compaſſo nel punto K. & ſia ſegnato
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                  11.
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                  &
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                  1.
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                  perche queſto è l'arco horario della
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                  undecima, & della prima hora. </s>
                  <s id="s.007749">& tanto è il Sole alto ſopra il Verticale g d. quanto è l'arco
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                  g
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                  11.
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                  & ſimilmente poſto l'un piede nel punto
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                  k.
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                  & l'altro nella hora
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                  10.
                    <emph type="italics"/>
                  &
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                  2.
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                  & ripor
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                  tata quella larghezza nel Meridiano, come s'è fatto, ſi ſegnerà
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                  10.
                    <emph type="italics"/>
                  &
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                  2.
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                  & tanto ſarà la
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                  circonferenza horaria, ſopra il detto piano, quanto è da g. a
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                  10.
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                  &
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                  2.
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                  con queſto modo pi­
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                  glierai le circonferenze horarie delle altre hore, & le riporterai nel Meridiano. </s>
                  <s id="s.007750">& dalle dette hore
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                  ſegnate nel Meridiano farai paſſare le linee per lo centro e. & quelle ti daranno le larghezze,
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                  delle ombre di quelle hore ſopra il piano del uerticale m o n. </s>
                  <s id="s.007751">Hora iſpedite le circonferenze ho
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                  rarie ſeguitano le uerticali, le quali ſi pigliano in queſto modo. </s>
                  <s id="s.007752">Paſſino per li punti ſegnati con la
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                  lettera i. linee egualmente diſtanti al diametro a e b. che cadino ad anguli giuſti ſopra il dia
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                  metro g e d. ne i punti p. & peruenghino alla circonferenza del Meridiano. </s>
                  <s id="s.007753">& ſiano ripor
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                  tate le lunghezze
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                  1. 11.
                    <emph type="italics"/>
                  &
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                  1. 1. 10.
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                  &
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                  2. 1. 9.
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                  &
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                  3. 1. 8.
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                  &
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                  4. 1. 7.
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                  &
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                  5.
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                    <emph type="italics"/>
                  ſopra le dette linee dalli punti ſegnati p. corriſpondenti, & ſegnati con la lettera ſ. </s>
                  <s id="s.007754">da i quali
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                  & dal centro e. ſi tireranno le linee alla circonferenza, doue ſi ſegnerà con la lettera t. &
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                  quelli archi, cheſaranno compreſi tra la lettera g. & la lettera t. ſaranno le circonferenze
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                  uerticali, che dimoſtreranno le larghezze dell'ombre ogni hora ſopra il piano uerticale. </s>
                  <s id="s.007755">con ſimi
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                  le modo, & uia riporterai dal ſemicircolo r u. del tropico del Cancro le circonferenze horarie,
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                  & uerticali pigliando le lunghezze, & le larghezze delle ombre, & poi diſcenderai al diſegna­
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                  re dell'horologio nel piano del uerticale con le hore antiche. </s>
                  <s id="s.007756">il che farai in queſto modo. </s>
                  <s id="s.007757">farai il
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                  circolo a b c d. che rappreſenti il piano uerticale a b. & il centro ſia e. & i dametri
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                  a c b d. di modo, che a. ſia all'occidente, b. & c. all'oriente. </s>
                  <s id="s.007758">Sia poi preſa dalla figura
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                  I. la diſtanza o i. & riportata in quella figura dal punto e. uerſo il b. ſopra la linea e b.
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                  nel punto f. per lo quale ſia tirata una linea egualmente diſtante al diametro a e c. & ſia
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                  quella linea g f h. la quale ci ſerue per lo diametro dello equinottiale. </s>
                  <s id="s.007759">Piglia poi dalla detta
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                  figura I. gli archi ouero le baſſezze delle ombre, & riportale dal centro e. alla detta linea
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                  g f h. ouero le circonferenze uerticali di qua & di la dal punto d. & quelle linee, che ueni
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                  ranno dal punto o. alla circonferenza preſa di qua, & di la dal punto d. taglieranno l'equi
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                  nottiale ne i punti conuenienti alle hore ſue: auuertendo, che biſogna tirare le dette linee occulte
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                  & ſolo ſignare i punti manifeſti nello equinottiale. </s>
                  <s id="s.007760">Hora per ſegnare le hore ne gli altri circoli
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                  equidiſtanti, piglierai prima le circonferenze uerticali dalla figura precedente II. del tropico del
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                  Capricorno al punto g. & le riporteraì da queſta nella circonferenza di qua & di la dal punto d.
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                  & tirerai le linee occulte dal punto e. alla circonferenza detta ne i punti di qua, & di la, dal
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                  punto d. & ſopra quelle dal punto e. riporterai le lunghezze delle ombre in ciaſcun'hora cor
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                  riſpondente. </s>
                  <s id="s.007761">& farai i ſuoi punti. </s>
                  <s id="s.007762">dalli quali, per li punti ſegnati nello equinottiale tirerai le linee
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                  delle hore nel ſuo horologio fin'alla circonferenza, eccetto quelle, che ſaranno terminate dalla li
                    <emph.end type="italics"/>
                  </s>
                </p>
              </subchap2>
            </subchap1>
          </chap>
        </body>
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    </archimedes>
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