Vitruvius Pollio, I dieci libri dell?architettura, 1567

Table of figures

< >
< >
page |< < of 520 > >|
    <archimedes>
      <text>
        <body>
          <chap>
            <subchap1>
              <subchap2>
                <p type="main">
                  <s id="s.008146">
                    <pb pagenum="448" xlink:href="045/01/462.jpg"/>
                    <emph type="italics"/>
                  der quello, che egli dice. </s>
                  <s id="s.008147">io eſponerò la mente ſua piu facilmente, che ſi puo. </s>
                  <s id="s.008148">Per drizzare adun
                    <lb/>
                  que la machina ſi ferma il piede di eſſa ad un palo, ouero ad altra coſa ſtabile, accioche la machi
                    <lb/>
                  na ui punti dentro. </s>
                  <s id="s.008149">Alla testa ſi legan non meno di due funi, accioche una uada dalla deſtra, l'al
                    <lb/>
                  tra dalla ſiniſtra & queſte credo io che da Vitr. antarie, & da Creci protoni, & da i marinari
                    <lb/>
                  ſartie dette ſono: ſtendeſi poi per la lunghezza della machina un'altra fune, la quale s'inuefte in
                    <lb/>
                  una taglia di ſopra, & un'altra di ſotto: dapoi questo è alquanto diſcoſto l'argana, o il molinel­
                    <lb/>
                  lo, al quale ſi riporta la fune predetta, che da noi codetta ſi chiama, ſi come la taglia da piedi,
                    <lb/>
                  è nominata paſtecca. </s>
                  <s id="s.008150">tirandoſi adunque ſopra il molinello, & uolgendoſi quella fune, ſi drizzerà
                    <lb/>
                  la machina apuntandoſi al palo, & drizzata, che ſarà, ſi reggerà poi al piacer noſtro con le fu­
                    <lb/>
                  ni, che ſaranno dalla deſtra, & dalla ſiniſtra, perche ammollando l'una, è tirando l'altra, ſi pie
                    <lb/>
                  gherà doue ſarà biſogno. </s>
                  <s id="s.008151">Ma perche le dette funi biſogno hanno di eſſere raccommandate ad al
                    <lb/>
                  cuna coſa, però douemo cauare una foſſa quadrata molto a fondo: iui ſi ſtende uno traue, al qua­
                    <lb/>
                  le ſi annoda la fune, che eſce dal ſuolo, ſopra queſto tronco attrauerſati ſono de gli altri pezzi
                    <lb/>
                  ſopra i quali ſi calca la terra, & coſi teniranno bene: uero è che pare, che Vitr. uoglia, che a
                    <lb/>
                  que pali, che eſceno della terra, ſi attacchi una taglia, credo queſto per ammollare piu commoda
                    <lb/>
                  mente le funi. </s>
                  <s id="s.008152">Ma l'ordimento de i menali, & delle taglie ſi ſarà al modo ſopradetto.
                    <emph.end type="italics"/>
                  </s>
                </p>
              </subchap2>
              <subchap2>
                <p type="head">
                  <s id="s.008153">
                    <emph type="italics"/>
                  Diuna machina ſimile alla ſopr apoſta a cui ſi com
                    <lb/>
                  metteno coſe maggiori mutato ſolo il moli­
                    <lb/>
                  nello in un Timpano. </s>
                  <s id="s.008154">Cap. IIII.
                    <emph.end type="italics"/>
                  </s>
                </p>
                <p type="main">
                  <s id="s.008155">MA ſe porre in opera uorremo coſe di maggior peſo, o grandezza, non douemo
                    <lb/>
                  fidarci de molinelli: ma ſi come il mol nello nelle orecchie è contenuto, co­
                    <lb/>
                  ſi in queſto caſo biſogna, che nelle orecchie u'entri un perno, nel mezo del
                    <lb/>
                  quale ci ſia un Timpano, che alcuni ruota, i Greci Ampheureſin, altri Peri­
                    <lb/>
                  trochio detto hanno, & in queſte machine le taglie uanno ad un'altro modo: perche & di
                    <lb/>
                  ſotto, & di ſopra hanno due ordini de raggi, & in tal modo il menale ſi fa trapaſſare nel
                    <lb/>
                  foro della taglia di ſotto, che i due capi ſieno eguali quando la fune ſarà ſteſa, & iui lungo
                    <lb/>
                  la taglia inferiore attorchiata una cordicella, et legate
                    <expan abbr="amēdue">amendue</expan>
                  le parti della fune ſieno con
                    <lb/>
                  tenute in modo, che non poſsino uſcire nè dalla deſtra, nè dalla ſiniſtra: fatto queſto i
                    <lb/>
                  capi della fune ſi riportano alla taglia di ſopra nella parte eſteriore, & ſono mandati giu
                    <lb/>
                  dal d'intorno de'raggi inferiori di quella & ritornano di nuouo a baſſo, & s'inueſteno nel
                    <lb/>
                  la taglia diſotto a raggi dalla parte interiore, & ſi riportano dalla deſtra, & dalla ſiniſtra
                    <lb/>
                  al Timpano che è nel perno, & iui ſi annodano: dipoi d'intorno al Timpano un'altra fune
                    <lb/>
                  ſi riporta all'argana. </s>
                  <s id="s.008156">queſta uoltata a torno riuolgendo il Timpano, & il perno, fa che le
                    <lb/>
                  funi legate al perno ſi ſtendino parimente, & coſi dolcemente ſenza pericolo leuano i pe­
                    <lb/>
                  ſi. </s>
                  <s id="s.008157">Ma ſe la machina hauerà un Timpano maggiore, o nel mezo, o in una eſtremità cal­
                    <lb/>
                  candoui in eſſo gli huomini, ſenza la manifattura dell'argana potrà hauer. </s>
                  <s id="s.008158">effetti piu
                    <lb/>
                  eſpediti. </s>
                </p>
                <p type="main">
                  <s id="s.008159">
                    <emph type="italics"/>
                  Tutta la difficultà d'intender bene l'artificio della ſopraſcritta machina, è poſta nell'ordimento
                    <lb/>
                  delle funi. </s>
                  <s id="s.008160">Vitr. dice prima l'effetto ſuo, che è di leuar peſi di maggior importanza, che la ma­
                    <lb/>
                  china poſta al ſecondo Cap. </s>
                  <s id="s.008161">Poi dimoſtra il modo di fabricarla: chiama egli colloſſicotera quelle
                    <lb/>
                  coſe che & di peſo, & di grandezza eccedono l'ordinario: ſi come coloſſi dette ſono le grandiſſi­
                    <lb/>
                  me ſtatue, & che ſono di molto maggior miſura della conſueta. </s>
                  <s id="s.008162">Drizzaſi la caualletta di groſſi,
                    <lb/>
                  & alti traui al modo ſopradetto: poi ſi fanno due taglie di quattro raggi per una, due diſotto &
                    <lb/>
                  due di ſopra al pari, una di quelle, alla qual ſi attacca l'uncino hauer deue un buco da baſſo
                    <emph.end type="italics"/>
                  , </s>
                </p>
              </subchap2>
            </subchap1>
          </chap>
        </body>
      </text>
    </archimedes>
Impressum