Heron Alexandrinus, Spiritali di Herone Alessandrino

Table of figures

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              <s>Del ballo de gli animali.</s>
              <s> LXXI.
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              <s>Se ſarà acceſo il fuoco ſopra d'vn'altare, gli ani-
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              mali, che vi ſono, parerà che ballino.
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                <figure number="84"/>
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              Sia l'altare ABCD, e'l focolare ſopra quello acceſo EF, dalla cima del
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              quale mandiſi vna canna GH fino al poſamento dell'altare, la parte
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              della quale, che è in H, quiui ſi riuolga ſopra il ſuo cnodace, o perno, e
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              l'altra che è in G volgaſi dento vna trõba, che ſia congiunta al focolare,
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              e queſta canna habbia anco altre quattro canne più piccole forate, e con-
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              giunte aſſieme con eſſe, e che ſi riſpondino diametralmente vna nell'al-
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              tra con diſtanze eguali, e ſieno ne i capi ripiegate ſimilmente a vicenda;
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              a queſte canne congiungaſi vn timpano IKLM, ſopra il quale ſtaranno
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              gli animali, che hanno a ballare, e la materia di che ſarà formato l'alta-
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              re, ſia traſparente, come a dire di vetro, o pure di corno, accioche per eſſa
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              ſi poſſino vedere gli animali, che ballano.</s>
              <s> Diſpoſto dunque il tutto in que-
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              ſto modo, ſe accenderemo il fuoco nel focolare, verrà a riſcaldarſi l'aria,
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