Heron Alexandrinus, Spiritali di Herone Alessandrino

Table of figures

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              Sia ſimilmente vna cappella in qualche baſe ABCD, nella quale ſia
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              l'altare E, e dall'altare partaſi la canna FGH, che rieſchi in vn piccio-
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              lo vtre K ben chiuſo da ogni parte; leghiſi ſotto l'vtre il peſo L ſoſtenu-
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              to da vna catenella, che partendoſi dall'vtre paſſi per vna girella, e ſi
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              leghi alle catene che ſono auolte intorno a i cardini, per modo che eſſendo
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              l'vtre ſgonfio, il peſo L trabocchi, e chiuda le porte; quali acceſo dopo
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              il foco ſi venghino ad aprire, peroche di nuouo l'aria che era dentro l'al-
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              tare rarefatto, e dilatato dal caldo, per la canna FGH paſſarà nell'v-
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              tre, e tirarà quello aſſieme col peſo L, talche le porte ſi apriranno; per-
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              che ouero ſi apriranno da loro poſta, ſi come quelle delle ſ
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              ufe ſi chiudano
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              da loro, ouero haueranno vn contrapeſo che l'aprira.</s>
              <s> Smorzato poſcia
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              il foco, e ritirandoſi l'aria, ch'era entrata nell'vtre, calara il peſo inſie-
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              me con l'vtre, e tirando chiuderà le porte.</s>
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