Heron <Alexandrinus>, Heronis Alexandrini spiritalium liber

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1913SPIRITAL. LIBER.
De Medio ſpiritali Diabete. II.
Eſt autem & alius, qui vocatur medius ſpiritalis diabetes
eandem actionem habens, quam inflexus ſiphon.
Sit enim vas ſimiliter aqua plenum A B: & per ejus fundum trajiciatur
tubus C D coarctatus ipſi fundo, &
in partem inferiorem excedens, oſcu-
lum autem ejus C non communicet cum ore vaſis A B, ſed alter tubus E F
ipſum circumſideat, ab eo undique æqualiter diſtans:
& oſculum qui-
dem ſuperius, ſquammula E G, ab oſculo C parum diſtante cooperiatur:
oſculum vero inferins tubi E F tantum diſtet à fundo vaſis A B, quantum
ad aquæ fluxum ſufficiat.
His ita diſpoſitis ſi per oſculum D ſimiliter attra-
hamus aerem, qui eſt in C D ſiphone, ſimul &
aquam, quæ eſt in vaſe AB
attrahemus, ita ut effluat, &
tunc tota fluet, quæ in AB vaſa aqua ob ex-
ceſſum ſiphonis extra, aër enim, qui interjicitur inter humidum &
tubum
E F, cum modicus ſit, poteſt ſe-
6[Figure 6] cedere in tubum C D, &
ſimul a-
quam attrahere, non conſiſtet au-
tem fluxus ob exceſſum extra, ete-
nim non exiſtente E F ceſſabit flue-
re, cum ſuperficies humidi ad C
fiat manente exceſſu:
ſed propter-
ea quod non poteſt aër ſubingredi
toto E F in aqua demerſo, fluxus
non conſiſtet &
qui ingreſſus eſt
aër in vas AB exeunti aquæ ſucce-
det:
totum enim exterius tubi of-
culum ad aquam ſemper humilius
eſt ſuperficie aquæ, quæ in vaſe:
cum autem non poſſit una fieri ſu-
perficies, totam excernit aquam,
&
majori gravitate fit attractio.
Quod ſi non velimus aërem, qui
in tubo C D continetur, ore attra-
here, infundemus aquam in vas
A B quouſque ſuperinfufa per tu-
bum C D principium fluxus acci-
piat, &
ita rurſus tota, quæ eſt in
A B vaſe, aqua exhaurietur, vocatur autem ut dictum eſt, C D E F ſpi-
ritalis ſiphon, vel ſpiritalis diabetes.

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