Heron <Alexandrinus>, Heronis Alexandrini spiritalium liber

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6054HERONIS
XXXVIII.
Contingit etiam aliter accenſo igne valvas aperiri.
45[Figure 45]
Sit rurſus ſacellum in aliqua bafi A B C D, in qua ſit ara E: & per
aram tubus F G H referatur in parvum utrem K undique præcluſum.
Utri
vero ſubijciatur pondus L, ex quo catenula per trochleam religetur ad
catenulas, quæ ſunt circa cardines, ita ut compreſſo utre pondus L evin-
cat, &
valvas claudat: impoſito autem igne aperiat. Rurſus enim aër, qui
eſt in ara calore effuſus per tubum F G H in utrem procedet, &
ipſum una
cum pondere L attrahet, &
valvæ aperientur. Nam vel ipſæ per ſeipſas
ſponte aperientur, quemadmodum balnearum valvæ ſponte

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