Heron Alexandrinus, Spiritali di Herone Alessandrino

Table of figures

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              ANNOTATIONI DI A.</s>
              <s> G.</s>
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              <s>Auertaſi che la mezza palla benche la figura non lo dimoſtri, deue eſſere tutta den-
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              tro nella baſe, & alquanto ſotto alla ſua ſuperficie, e quando ſi mette l'acqua den-
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              tro la baſe, facciaſi che ariui ſolamente fino al piano della mezza palla, acciò ui reſti
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              luogo doue poſſa ritirarſi l'acqua, quando uiene cacciata dal fiato fuori della mezza
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              palla.
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              <s>Della palla, che ſi riuolge.</s>
              <s> L.
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              <s>A fare che poſto vn vaſo al fuoco, ſi riuolga vna
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              palla intorno ad vn cnodace.
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              Sia il vaſo con l'acqua
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              dentro, e poſto al fuoco AB
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              al quale ricopraſi bene la
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              bocca co'l coperchio CD,
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              eſſendo forato aſſieme con
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              eſſo la canna torta EFG,
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              il cui capo G ſi accommodi
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              alla palla cauata, e vota
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              HK, & a queſto capo ſi
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              opponghi per diametro il
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              cnodace LM, ſtabilito ſo-
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              pra il coperchio CD, &
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              habbia la palla, due canne
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              torte vna dirimpetto l'al-
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              tra forate aſſieme con lei, e
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              piegate ſcambieuolmente,
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              e quelle piegature faccino
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              gli angoli retti.</s>
              <s> Seguirà
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              dunque che riſcaldato il va_
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              ſo, il vapore che paſſa nel-
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              la palla per la canna EFG
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              caderà fuori per quelle canne torte, e volgerà la palla; ſi come ſi vede
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              auenire de gli animali, che ballano.</s>
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