Heron <Alexandrinus> - Heronis Alexandrini spiritalium liber

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2115SPIRITAL. LIBER.

De fluxu partim æquali partim inæqualiper ſiphonem. IV.

At ſluxus partim quidem æqualis, partim vero inæqualis
fit per ſiphonem: voco autem partim æqualem, & partim
inæqualem, quando per aliquod tempus volentibus nobis
æqualis ſit factus à principio fluxus, & rurſus per aliud tem-
pus ſi ita nobis placeat, æqualis ſit per ſe ipſum, priori vero
vel tardior, vel velocior.

Sit enim rurſus aquæ vas

8[Figure 8] A B, lebes C D, per oper-
culum vero, & fundum le-
betis trajiciatur canalis la-
tior, quam crus interius ſi-
phonis: & ſit hic canalis
M L, coarctatus & opercu-
lo, & fundo lebetis: oper-
culo autem inſiſtat pegma-
tium ex regulis compactum,
quemadmodum littera ◠,
& ſit CNXD. In regulis
autem rectis C N, X D ex
interiori parte ſecundum
earum longitudinem inſcul-
pantur canales, in quibus
altera regula O P expedite
percurrat: ſit etiam co-
chlea R S recta pertingens
ad operculum C D, & per
foramen, quod eſt in regula O P tranſiens: ſit præterea tylus aliquis regula
O P conjunctus, ita ut inſeratur in helicem cochleæ, excedat autem co-
chlea ſupra regulam N X, & exceſſui adnectatur anſa, per quam cochleam
convertamus, ita ut regula O P interdum quidem ſublimis fiat, interdum
vero depreſſa: cui regulæ conjunctum ſit crus interius ſiphonis, permeans
etiam per canalem L M, adeo ut oſculum ipſius aqua, quæ in vaſe demer-
gatur. Si igitur rurſus per oſculum exterius humidum attrahamus, fluet
ſiphon æqualiter, quouſque totum, quod eſt in vaſe, humidum exhauria-
@ur. Quando autem volumus per ipſum alterum fieri fluxum,

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