Heron <Alexandrinus>, Heronis Alexandrini spiritalium liber

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118112JO. BAPT. ALEOTTI
Fabricare conclave, in quo quando libitum fuerit, ventus
ſpiret, qui id refrigeret, pro libitu modo lenior, modo
fortior.
Theorema IV.
EXcavetur ſub plano conclavis A B C D E, quantum videbitur ſuffice-
re pro quantitate venti intromittendi, conclave tam latum, quam
iſtud conclave eſt altum, ad minimum pedibus decem;
ſitque calce in-
termixtis lapidibus æqualis quantitatis plus minus ſubtiliſſimè ſubacta ſe-
cundum qualitatem calcis optimè oblitum &
interlitum: dividaturque in
93[Figure 93] duo conclavia intermedio fornice vel diaphragmata, ut X Y.
Quorum
unumquodque ſit 5 pedum, &
oblitum. Quotidie per ſpacium octo die-
rum humectetur tectorium, complanetur &
poliatur optime opera fabri
murarii, ita ut concavia continere valeant &
aërem & aquam,

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