Heron <Alexandrinus> - Heronis Alexandrini spiritalium liber

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7064HERON@S

XLVIII.

Thyrſum in aquam demiſſum edere ſonum vel fiſtulæ,
vel alicujus aviculæ.

Sit thyrſus ABCD fo-

55[Figure 55] ramen habens ad verticem
corymbi D, ſitque co-
rymbus concavus, velut
nux pinea: & caulem in-
terſeptum habeat paululum
ſub os, diaphragmate AE.
Huic autem apponatur ſy-
ringula F ſub os tubi loca-
ta, & ſimul perforata cum
diaphragmate. Quando igi-
tur thyrſum in aquam in-
jicientes deorſum premi-
mus, aër, qui in ipſo eſt,
ab aqua eliſus ſonum efficit.
& ſi quidem ſyringula ſit
ſola, ſyringæ ſonum edet,
ſi vero adſit quantitas aquæ
ſub diaphragmate, erit ſo-
nus cum clangore.

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