Heron <Alexandrinus>, Heronis Alexandrini spiritalium liber

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8579SPIRITAL. LIBER. pinquus aër, atque hic infuſam in collum aquam ſimul attrahet, ita ut ſu-
peremineat oſculum F.
Ac propterea aëre ingreſſum habente canalis P
fluet, quouſque poculum ſurſum impulſum, faciat aquam, quæ eſt in col-
lo, reſpirationem obſtruere.
Rurſus enim in priorem locum reſtituetur,
&
non amplius fluet P canalis: idque toties fiet, quoties ſubtrahitur, &
offertur poculum.
Oportet autem non totum poculum ſubtrahi, ne to-
tum ſiphonis crus denudetur.
Itaque canalis M N conformetur in thyr-
ſum, &
R N circa ipſum ut ſpectaculum recte ſit diſpoſitum.
LXIII.
Conſtructio lagenæ vociferantis, quando humidum ef-
fluat.
Sit deſcripta lagena col-
70[Figure 70] lum quidem obſtructum
habens diaphragmate A B,
os vero diaphragmate
C D:
& per utraque dia-
phragmata producatur tu-
bus E F ſimul cum ipſis
perforatus.
Lagenæ autem
auricula ſit G H:
atque ex
altera parte ſit tubus K L
ſimul perforatus cum A B
diaphragmate &
ab ipſo
C D tantum diſtans, quan-
tum ad aquæ fluxum ſuffi-
ciat.
Ad diaphragma vero
C D ſit ſyringula M, quæ
vocem edere poſſit.
Ita-
que implebitur lagena per
tubum E F, aëre tum per
K L tubum, tum per ſy-
ringulam M excedente.
Quando igitur lagenæ au-
riculam detinentes reclina-
mus ita ut aqua effluat,
fluet quidem per tubum
E F in partes exteriores;

per K L vero procedet in collum B C.
Et qui in ipſo eſt aër expulſus

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