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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