Heron <Alexandrinus>, Heronis Alexandrini spiritalium liber

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6761SPIRITAL. LIBER.
XLIV.
ALITER, etiam ex diſtantiis ſoni hoc modo fiunt.
51[Figure 51]
Eſt vas habens plura diaphragmata tranſverſa: in locis autem diabetæ
ſunt ad inferiores locos deferentes, fluxibuſque inæquales:
& in loco
inferiori apponitur ſyringula ſonum edens.
In ſuperius autem vas defer-
tur aquæ fluxus.
Itaque repleto ſuperiori vaſe contingit humidum pe@
diabetem, qui eſt in ipſo in inferius procedere, quouſque ad ultimum de-
venerit.
Quippe cum vas præcluſum ponatur. At vero aër, qui in ipſo eſt
extruſus per fiſtulam ſonum perficit.

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