Vitruvius Pollio, I dieci libri dell?architettura, 1567

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                  <s id="s.007870">
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                  diano, come hauemo detto di ſopra. </s>
                  <s id="s.007871">Parmenione ſecondo le eleuationi del polo in diuerſi paeſi
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                  bauute per relatione di perſone, ouero di ſcrittori accommodaua gli horologi, la doue ancho Theo
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                  doſio, & Andrea fecero gli horologi uniuerſali, che ſeruiuano ad ogni inclinatione, o clima,
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                  che ſi dica. </s>
                  <s id="s.007872">perche ogni horologio fermo, che ſia fatto nel piano dello Equinottiale, o nel piano
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                  dell'aſſe del monde alzato, ouero abbaſſato ſopra la quarta del circolo alla eleuatione del polo,
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                  ouero dello equinottiale, & che ſia diuiſo in parti uentiquattro, ci ſeruirà in ogni paeſe. </s>
                  <s id="s.007873">Fannoſi
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                  anche horologi per ogni clima, che ſi uoltano al corſo del Sole, come è quello di Ciouanni Sta­
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                  bio, & quello di Pietro Appiano. </s>
                  <s id="s.007874">lo Analemma di quelli è lo iſteſſo con lo Analemma di Vitr.
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                  con alcune aggiunte del Munſthero & di Orontio. </s>
                  <s id="s.007875">ma è coſa trouata da gli antichi. </s>
                  <s id="s.007876">come è il pla­
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                  nisferio del Roias, & le coſe del Sconero. </s>
                  <s id="s.007877">Pelecino è detto dalla forma di ſecure, che io crederei,
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                  che fuſſero gli horologi, che hanno le hiperbole, cioè i paralleli de i ſegni, come ſono gli horologi
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                  fatti nel piano orizontale, & nel piano uerticale poſti di ſopra. </s>
                  <s id="s.007878">Il Cono è formato da una rego­
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                  la, che ſi parte dal centro, & ſi ſtende nello hemiſpero di ſotto, fin all'eſtreme declinationi de i
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                  tropici. </s>
                  <s id="s.007879">& le estremità di quello non terminano in alcuna oppoſta ſuperficie. </s>
                  <s id="s.007880">Puo anche eſſer il
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                  Trigono Zodiaco deſcritto dal Munſtero. </s>
                  <s id="s.007881">Ma quello, che dice Vitr. </s>
                  <s id="s.007882">Gonarche, Engonaton, &
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                  Antiboreo, penſo io, che fuſſero horologi, che haueſſero riſpetto à qualche imagine celeſte, oue­
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                  ro alle parti del cielo, ouero alla notte, che tutti però ſi pigliauano da i proprij Analemmi. </s>
                  <s id="s.007883">
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                  L'horologio, che Compaſſo è detto, è di quelli, che ſogliono portare ſeco i uiandanti. </s>
                  <s id="s.007884">le anella, i
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                  Cilindri, i quadranti, i circoli piani, ſono di quelli, che ſtanno appeſi, de i quali ne ſono pieni i
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                  libri de gli horologiografi. </s>
                  <s id="s.007885">& coſi fa fine Vitru. alla materia de gli horologi da Sole detta Gno­
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                  monica. </s>
                  <s id="s.007886">Noi di piu de gli antichi hauemo gli horologi da ruote, o da ſpennole & quelli d'a­
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                  rena, che ſono mirabili, quelli per lo ingegno dello artefice, queſti per la commodità, & facilità
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                  loro. </s>
                  <s id="s.007887">Ciſono anche horologi da fuoco fatti in lucerne, de i quali ne parla Herone, che moſtrano
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                  le hore al conſumare dell'oglio. </s>
                  <s id="s.007888">ci ſono ancho horologi da acqua, de i quali ragiona Vit. dicendo.
                    <emph.end type="italics"/>
                  </s>
                </p>
                <p type="main">
                  <s id="s.007889">Oltra di queſto da gli iſteſsi ſcrittori ſi ſono cercate le ragioni de gli horologi da ac­
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                  qua: & primamente da Cteſibio Aleſſandrino, ilquale trouò gli ſpiriti naturali, & le coſe
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                  da uento. </s>
                  <s id="s.007890">Ma è coſa degna, che gli ſtudioſi conoſchino come ſiano ſtate queſte coſe inue­
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                  ſtigate, & cercate. </s>
                  <s id="s.007891">Cteſibio nacque in Aleſſandria, & fu figliuolo d'un barbieri: eſſendo
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                  coſtui eccellente oltra gli altri d'induſtria, & d'ingegno, diceſi, che ſi dilettaua grandemen
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                  te di coſe artificioſe: imperoche uolendo, che nella bottega di ſuo padre uno ſpecchio
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                  pendeſſe in modo, che quando egli fuſſe tratto fuori, & ritornaſſe in ſu, fuſſe una cordi­
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                  cella ſottile aſcoſa, che tiraſſe il peſo a baſſo, coſi fece l'ordigno. </s>
                  <s id="s.007892">Egli conficcò ſotto uno
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                  traue un canale di legno, & iui poſe le taglie, o girelle che ſi dichino, & per lo canale con
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                  duſſe la cordicella picciola in uno angulo. </s>
                  <s id="s.007893">iui fece le canne, per lequali dalla cordicella man
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                  dò giu una palla di piombo, dalche nacque, che il peſo andando allo in giu, per le ſtret­
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                  tezze delle canne premeua con la uelocità del calare la denſità dello aere. </s>
                  <s id="s.007894">& ſcacciando
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                  per la bocca delle canne la frequentia dello aere raſſodata per quella compreſsione nello
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                  aperto aere, & col toccamento, o percoſſa eſprimeua chiaramente il ſuono. </s>
                </p>
                <p type="main">
                  <s id="s.007895">
                    <emph type="italics"/>
                  Era uno ruotolo, nel quale erano inuolte due cordicelle per uno uerſo, i capi dellequali pen­
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                  deuano da una parte, & all'uno de capi era appeſo uno ſpecchio, all'altro non u'era attacato al­
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                  cuna coſa, ma egli ſi laſciaua per tirare, & uoltare il ruotolo. </s>
                  <s id="s.007896">tirando adunque, & ſuogliendoſi
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                  il ruotolo, ancho lo ſpecchio tirando peſaua, & ſuolgeua l'altro capo, coſi ueniua giu, ma la­
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                  ſciando il capo, il ruotolo ſi riuolgeua, & inuoltaua le cordicelle, & coſi il peſo andaua allo in
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                  ſu. </s>
                  <s id="s.007897">Ma come queſto ſi poteſſe fare, io dico, che nel mezo del ruotolo era un'altra cordicella auol­
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                  ta al contrario delle due, allaquale era attac ato un peſo, il quale peſando piu dello ſpecchio, quan
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                  do ſi rilaſciaua il capo della cordicella, il peſo, che era prima ſalito calaua al baſſo, perche la ſua
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                  cordicella ſi ſuolgeua, & lo ſpecch o ſaliua, perche la ſua cordicella, s'inuolgeua. </s>
                  <s id="s.007898">la cordicella
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                  adunque, che teneua il peſo, era condotta naſcoſamente per un canale di legno ad un angulo
                    <emph.end type="italics"/>
                  </s>
                </p>
              </subchap2>
            </subchap1>
          </chap>
        </body>
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    </archimedes>
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