Vitruvius Pollio, I dieci libri dell?architettura, 1567

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                  <s id="s.008125">
                    <pb pagenum="446" xlink:href="045/01/460.jpg"/>
                    <figure id="id.045.01.460.1.jpg" xlink:href="045/01/460/1.jpg" number="139"/>
                    <lb/>
                    <emph type="italics"/>
                  ta da latini, o greci ſi chiamano, ſono alle fi­
                    <lb/>
                  gure E. F. ſi come le ſorti de i ganzi, uncini
                    <lb/>
                  o forcipi ſono alle figure. </s>
                  <s id="s.008126">I. K. L. </s>
                  <s id="s.008127">Poſto a­
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                  dunque la pratica delle taglie uenirò alla ra­
                    <lb/>
                  gione di eſſe, accioche ci ſia noto la coſa ſignifi­
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                  cata, & quella che ſignifica: La fabrica è il
                    <lb/>
                  diſcorſo, l'effetto, & la cagione delle coſe. </s>
                  <s id="s.008128">Non
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                  è dubbio che ſe ad una ſemplice fune ſi attacca
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                  un peſo, poniam caſo di mille libre, che tutta la
                    <lb/>
                  fatica & ſorza non ſia unit amente da quella
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                  fune ſoſtenuta, che poi ſe la delta fune ſarà rad­
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                  doppiata & a quella una taglia d'un raggio ap­
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                  poſta doue penda quel peſo, che la fune non
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                  ſia per hauer il doppio meno di fatica, & il
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                  doppio meno di forza non baſti ad alzar quel
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                  peſo: hor che ſarà poi, ſe ci ſaranno due taglie,
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                  o piu? </s>
                  <s id="s.008129">o ſe ſi moltiplicheranno i raggi? </s>
                  <s id="s.008130">non ſi
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                  partirà quel peſo in piu parti? </s>
                  <s id="s.008131">non ſi maneg­
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                  giarà piu ageuolmente? </s>
                  <s id="s.008132">non ci uorrà molto
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                  menor forze a tirarlo? </s>
                  <s id="s.008133">certo ſi, & di modo, che
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                  ſe'l primo raddoppiamento leua la metà del pe­
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                  ſo, il ſecondo alquale reſta una metà, leuerà uia
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                  la metà di quella metà che ſarà la quarta parte
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                  ditutto'l peſo, & dalla quarta parte della forza
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                  di prima ſarà il detto peſo leuato: la doue ſe non
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                  fuſſe la grauità delle funi, l'aſprezza de i rag­
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                  gi, & la tardezza del moto per li molti ra­
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                  uolgimenti della fune, che ſono i difetti non del­
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                  la forma, ma della materia, un fanciullo pre­
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                  ftamente alzarebbe un ſmiſurato peſo: ma dar
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                  il ſapone alle funi, l'ugnere i raggi, il far be­
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                  ne le taglie con i raggi dritti, l'acconciar i me­
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                  nali, che non s'intrichino, o rodino inſieme, eſ­
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                  ſendo i pernuzzi a miſura, & proportionati,
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                  fanno ageuoli queſte fatiche, & tanto piu ſe
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                  gli aggiugnemo i molinelli, che leuano la lor par
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                  te del peſo, & della fatica, come il moltiplicar
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                  delle taglie, & de i raggi, & queſti ancho piu
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                  ageuolmente ſi muoueno, quanto le loro ſtan­
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                  ghe ſono maggiori, perche la lunghezza ſi al­
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                  lontana dal centro, che è immobile, & impe­
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                  diſce il mouimento: & tanto ſia detto della ra­
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                  gione delle taglie.
                    <emph.end type="italics"/>
                  </s>
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    </archimedes>
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