Heron <Alexandrinus> - Heronis Alexandrini spiritalium liber

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9286HERONIS

LXIX.

Theſauri conſtructio rotam habentis æneam, verſatilem,
quæ ἁ{γν}ι{ςή}{ρι}ον appellatur. Hanc enim ad ſacra accedenter con-
vertere ſoliti ſunt. Itaque contingit dum rota convertitur
melancoryphi vocem reddi, atque ipſam aviculam inſiſten-
tem converti. Converſa autem ea melancory phum non am-
plius vocem emittere, neque converti.

Sit theſaurus ABCD,

76[Figure 76]& axis in ipſo diſpoſitus
EF facile verſatilis. Ei
vero conjungatur rota
HK, quam convertere
oportet. Sint præterea
duæ rotæ LM eidem axi
intus conjunctæ, qua-
rum L quidem exeli-
ctram habeat, M vero
radiata ſit. Circa exeli-
ctram funis involvatur.
à cujus extremo ſuſpen-
datur clibanus N, tu-
bum habens X O, & in
ſummitate ſyringulam,
quæ melancoryphi vo-
cem reddat. Subjiciatur
autem clibano aquæ vas
P R. Et à vertice the-
ſauri demittatur axicu-
lus S T, qui facile con-
verti poffit. Habeatque ad S melancoryphum, ad T vero tympanum ra-
diatur, cujus radii radiis tympani Mimplicentur. Continget igitur con-
verſa rota HK, funem circa exelictram involvi, & clibanum ſuſtinere.
At rota dimiſſa clibanum ob gravitatem deſcendens in aquam aëre expulſo
ſonum edere. Simul vero & melancoryphum converti ob converſionem
tympanorum.

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