Vitruvius Pollio, I dieci libri dell?architettura, 1567

Page concordance

< >
Scan Original
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
< >
page |< < of 520 > >|
    <archimedes>
      <text>
        <body>
          <chap>
            <subchap1>
              <subchap2>
                <p type="main">
                  <s id="s.007683">
                    <pb pagenum="415" xlink:href="045/01/429.jpg"/>
                    <emph type="italics"/>
                  undici, & una, & doue ella taglia il Meridiano fa punto
                    <emph.end type="italics"/>
                  11.
                    <emph type="italics"/>
                  &
                    <emph.end type="italics"/>
                  1.
                    <emph type="italics"/>
                  queſto ſarà l'arco Orizon
                    <lb/>
                  tale compreſo dalla circonferenza z.
                    <emph.end type="italics"/>
                  11.
                    <emph type="italics"/>
                  Similmente piglia l'arco Orizontale delle dieci. </s>
                  <s id="s.007684">&
                    <lb/>
                  delle due ponendo la riga ſopra il centro e. & ſopra i punti
                    <emph.end type="italics"/>
                  10.
                    <emph type="italics"/>
                  &
                    <emph.end type="italics"/>
                  2.
                    <emph type="italics"/>
                  della linea
                    <emph.end type="italics"/>
                  10.
                    <emph type="italics"/>
                  &
                    <emph.end type="italics"/>
                    <lb/>
                  2.
                    <emph type="italics"/>
                  & doue la riga taglia il Meridiano ſegna
                    <emph.end type="italics"/>
                  10.
                    <emph type="italics"/>
                  &
                    <emph.end type="italics"/>
                  2.
                    <emph type="italics"/>
                  perche l'arco compreſo tra z. </s>
                  <s id="s.007685">&
                    <emph.end type="italics"/>
                    <lb/>
                  10.
                    <emph type="italics"/>
                  &
                    <emph.end type="italics"/>
                  2.
                    <emph type="italics"/>
                  è l'arco Orizontale delle
                    <emph.end type="italics"/>
                  10.
                    <emph type="italics"/>
                  & delle
                    <emph.end type="italics"/>
                  2.
                    <emph type="italics"/>
                  con ſimile ordine piglierai gli archi Ori
                    <lb/>
                  zontali delle altre hore, & gli noterai ſopra il Meridiano come hai fatto delle
                    <emph.end type="italics"/>
                  11.
                    <emph type="italics"/>
                  &
                    <emph.end type="italics"/>
                  1.
                    <emph type="italics"/>
                  & del
                    <lb/>
                  le
                    <emph.end type="italics"/>
                  10.
                    <emph type="italics"/>
                  &
                    <emph.end type="italics"/>
                  2.
                    <emph type="italics"/>
                  queſti archi ſono compreſi tra l'Orizonte fermo, & il Verticale mobile, come ho
                    <lb/>
                  detto, & ſono le circonferenze, che comprendeno gli anguli fatti da due piani, cioè dal Ver­
                    <lb/>
                  ticale mobile, & dal fermo, come ci è manifeſto per le coſe dette di ſopra. </s>
                  <s id="s.007686">Eſpedite
                    <lb/>
                  tutte queſte coſe, egli ſi uenirà alla fabrica dell'horologio in queſto modo. </s>
                  <s id="s.007687">Farai un
                    <lb/>
                  circolo della grandezza del Meridiano gia poſto nello Analemma, & ſia quello a b c
                    <lb/>
                  d. in queſto circolo il diametro b c. ci ſerue per la linea Meridiana. </s>
                  <s id="s.007688">& il diametro a d.
                    <lb/>
                  ci ſerue per la linea del piano. </s>
                  <s id="s.007689">ma biſogna tirare queſta linea del piano occulta. </s>
                  <s id="s.007690">Sia il centro e.
                    <lb/>
                  doue la linea del piano taglia la Meridiana, & doue s'imagina, che ſia il Gnomone. </s>
                  <s id="s.007691">piglia poi
                    <lb/>
                  la diſtanza, che è dal punto z. </s>
                  <s id="s.007692">alle undici nel Meridiano nella figura antecedente ſegnata I. &
                    <lb/>
                  riportala dal punto d. uerſo il punto c. nel punto H. & tira poi dal centro a. al punto H.
                    <lb/>
                  una linea occulta. </s>
                  <s id="s.007693">Similmente riporterai la detta diſtanza dal punto a. uerſo il punto c. nel
                    <lb/>
                  punto M. </s>
                  <s id="s.007694">Queſte diſtanze d H. & a M. ſono gli archi Orizontali della undecima, et della prima
                    <lb/>
                  hora; ſi che d H. è della undecima, & a M. della prima. </s>
                  <s id="s.007695">Piglia poi la lunghezza dell'ombra
                    <lb/>
                  della undecima hora dalla figura doue ſegnaſti le lunghezze delle hore dal punto z. </s>
                  <s id="s.007696">ſopra la li­
                    <lb/>
                  nea del piano uerſo il punto T. al punto
                    <emph.end type="italics"/>
                  11.
                    <emph type="italics"/>
                  & riportala nell'horologio dal centro e. ſopra
                    <lb/>
                  le linee e H. & e M. & ſegna
                    <emph.end type="italics"/>
                  11.
                    <emph type="italics"/>
                  &
                    <emph.end type="italics"/>
                  1.
                    <emph type="italics"/>
                  Piglia poi lo arco Orizontale delle
                    <emph.end type="italics"/>
                  10.
                    <emph type="italics"/>
                  & del
                    <lb/>
                  le
                    <emph.end type="italics"/>
                  2.
                    <emph type="italics"/>
                  dalla figura precedente dal punto
                    <emph.end type="italics"/>
                  2.
                    <emph type="italics"/>
                  al punto
                    <emph.end type="italics"/>
                  10.
                    <emph type="italics"/>
                  & riportala nell'horologio ſotto il
                    <lb/>
                  punto d. dall'una parte, & ſotto il punto a. dall'altra ne i punti N O. a i quali dal centro
                    <lb/>
                  e. tirerai le linee e N. & e O. </s>
                  <s id="s.007697">Quiui gli ſpatij, che ſono da N d. & da o. ad a. ſono gli
                    <lb/>
                  archi Orizontali di quelle hore cioè delle
                    <emph.end type="italics"/>
                  10.
                    <emph type="italics"/>
                  & delle
                    <emph.end type="italics"/>
                  2.
                    <emph type="italics"/>
                  Piglia poi la lunghezza dell'ombra
                    <lb/>
                  delle
                    <emph.end type="italics"/>
                  10.
                    <emph type="italics"/>
                  & delle
                    <emph.end type="italics"/>
                  2.
                    <emph type="italics"/>
                  dalla ſopra poſta figura O. & riportala dal centro e. ſopra le dette li­
                    <lb/>
                  nee e N. & e o. & ne i punti doue termina la lunghezza dell'ombre ſegna ſopra la e N.
                    <emph.end type="italics"/>
                    <lb/>
                  10.
                    <emph type="italics"/>
                  & ſoprala e o.
                    <emph.end type="italics"/>
                  2.
                    <emph type="italics"/>
                  con ſimile ragione procederai nel ponere le altre hore, & di altri ar­
                    <lb/>
                  chi Orizontali, & le altre lunghezze delle hore, & uederai riuſcire la linea della hiperbole ſe le
                    <lb/>
                  gherai tutti que punti con una linea. </s>
                  <s id="s.007698">Il ſimile ſi fa a ponere gli archi Orizontali delle hore del­
                    <lb/>
                  l'altro tropico, cioè del Capricorno. </s>
                  <s id="s.007699">perche anche quelli ſi pigliano dalla antecedente figura I.
                    <lb/>
                  con le diſtanze dal punto
                    <emph.end type="italics"/>
                  2.
                    <emph type="italics"/>
                  alle hore ſegnate dalla deſtra del taglio commune dell'Orizonte,
                    <lb/>
                  & del piano come uedi. </s>
                  <s id="s.007700">& a queſto modo nella parte contraria ti riuſcirà la linea hiperbole
                    <lb/>
                  oppoſta a quella, che faceſti nelle hore del Cancro. </s>
                  <s id="s.007701">& ſegnata che l hauerai con i ſuoi punti, o
                    <lb/>
                  numeri tirerai le linee da una hiperbole all'altra, & a queſto modo hauerai ſegnato l'horologio
                    <lb/>
                  con le hore de gli antichi. </s>
                  <s id="s.007702">come nella figura V. uederai. </s>
                  <s id="s.007703">& ſe uorrai porui le hiperbole fatte
                    <lb/>
                  da gli altri ſegni, & hore, lo farai con la iſteſſa ragione. </s>
                  <s id="s.007704">& ſempre l'equinottiale ti porgerà una
                    <lb/>
                  linea dritta, la quale ſarà tanto diſtante dal Gnomone, quanto ſarà longa l'ombra equinottiale
                    <lb/>
                  ſu'l mezo dì ſopra la linea del piano. </s>
                  <s id="s.007705">ma in queſta eleuatione di polo alla inclinatione di Vinetia
                    <lb/>
                  la linea equinottiale ſarà tanto diſtante dal Gnomone, quanto è alto il Gnomone. </s>
                  <s id="s.007706">Io ho uoluto
                    <lb/>
                  ponere tanti circoli ſeparatamente per dimoſtrare ſenza confuſione come ſi fa lo Analemma fini­
                    <lb/>
                  to, dal quale ſi caua la ragione, & la pratica di fare l'horologio. </s>
                  <s id="s.007707">Però ſe uuoi fare lo Analem
                    <lb/>
                  ma intiero, diſegnerai ſelamente in qualche materia ſoda o pietra, o legno, o rame quelli circo­
                    <lb/>
                  li, che ſi richiedeno in ogni Analemma, come è il Meridiano, i diametri di tutti i paralleli, cioè
                    <lb/>
                  de i tropici, & de gli altri ſegni, col diametro dello equinottiale, & poi uolendo fare l'horologio
                    <lb/>
                  a quella inclinatione di cielo, che ti piace, farai l'Orizonte, & il Verticale, & le diuiſioni ſi del
                    <lb/>
                  le altezze del Sole, come de gli archi Orizontali di modo, che ſi poſſino leuar uia, poi che ti ha-
                    <emph.end type="italics"/>
                  </s>
                </p>
              </subchap2>
            </subchap1>
          </chap>
        </body>
      </text>
    </archimedes>
Impressum