Heron Alexandrinus, Spiritali di Herone Alessandrino

Table of figures

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              <s>Della palla traſparente.</s>
              <s> XLVI.
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              <s>Si fà ſimilmente vna palla traſparente, che hab-
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              bia dentro di ſe l'aria, e l'acqua, e nel mezzo vna
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              palla a ſomiglianza del mondo.
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              Si fanno due mezze palle di
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                <figure number="58"/>
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              vetro, vna delle quali ſi ricopre
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              con vna lamina, o piaſtra di ra-
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              me, che habbia vn foro tondo nel
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              mezzo; dopo ſi fà vn'altra palla
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              più piccola, e leggiere, e gettaſi
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              nell'acqua, che è in vna delle due
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              mezze palle, & a queſta poi ſi
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              ſoprapone l'altra mezza palla co_
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              perta; e cauata vna parte dell'ac-
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              qua, la palla ſi fermarà nel luogo che è in mezzo, talche per via di
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              queſt'altra mezza palla ſi riduce in effetto quanto ſi era propoſto.</s>
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              <s>Della goccia, che ſtilla percoſſa dal Sole.</s>
              <s> XLVII.
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              <s>Quella che ſi chiama goccia, ſtilla percotendo
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              in eſſa il Sole.
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              Sia vna baſe rinchiuſa ABCD, per la quale mettaſi vn'infondibolo,
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              che con la ſua cannella vadi non molto lunge al fondo; e ſia la palla EF,
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              dalla quale partendoſi vna canna, entri nella baſe, diſcoſtandoſi poco dal
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              fondo del vaſo, e dalla faccia di ſopra della palla; & accommodata vna
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              canna torta nella palla, che vadi a riuſcire nell'infondibolo, mettaſi poi
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              dell'acqua nella palla.</s>
              <s> Quando il Sole dunque percote nella palla, ve-
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              nendo riſcaldata l'aria che vi è dentro, diſcaccia l'acqua, & ella ſe ne
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              paſſa per la canna G, e mediante l'infondibolo, ſi conduce nella baſe; ma
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              </s>
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