Schott, Gaspar, Mechanica hydraulico-pneumatica. Pars I. Mechanicae Hydraulico-pnevmaticae Theoriam continet. , 1657

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cruris CD, & diligenter coarcta in­
ter ſeſe, nè aër inter vtrumque tranſire
poſſit.
His factis aperios inferius.
Et ſi quidem tubus rectus DE lon­
gior fuerit quàm crus AB à ſupre­
ma ſuperficie aquæ vaſis vsque ad B;
effluet aqua ex E, aſcendetque
qua vaſis A, per crus AB, indeque
per CD, crus deſcendet, donec
tota effluxerit ex ore E.
Si aut de­
urtetur tubus DE in F, fiatque
æqualis cruri AB; aſendet aqua va­
ſis A ſolùm uſque ad B, quàm diu vi­
delicet aqua ex F effluit; quâ elapsâ,
relabetur aqua cruris AB intra vas
A, Si idem tubus DE decurtetur
in G, aut H, fiatque brevior quàm
crus AB; aſcendet aqua per AB ſo­
lùm aliquòuſque, & deinde rela­
betur.
Experientiam quilibet fa­
cilè poterit facere.
Experimë­
tum aliud:
oſtendens
vim attra­
ctivam a­
quæ in altum.
13[Figure 13]
Nec ſufficit vt tubus EF, ſupe­
rioris figuræ ſit quacunque ratione longior tubo BK, ſed neceſſari­
um eſt, vt perpendiculum ipſius EF, ſit longius quàm perpendicu­
lum BK, hoc eſt, vt tubus EF perpendiculariter deſcendat
profundiùs infra vas C, quàm tubus BK aſcendat perpendi­
culariter ſupra vas B.
Quare ſi tubus EF centum & vnius pe­

dum inclinaretur infra vas C, aut convolveretur in helicem,
vt hîc apparet, ita vt perpendiculum ipſius ſolùm eſſet pedum
v.g. 60. ab E vſque ad D v.g. & non vſque ad N; neutiquam
ſufficeret; ſed omnino neceſſarium eſt, vt perpendiculum ſit
etiam ad minimùm centum pedum, & pertingat vſque ad N.
Et
hæc perpendiculi menſura adeo eſt neceſſaria in hydraulicis hi­
ſce operationibus, vt Natura falli nulla arte, nullo dolo, nullaque;
experientia poſſit.
Ioannes Baptiſta Porta lib. 2. Spirital. cap.

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