Heron <Alexandrinus> - Heronis Alexandrini spiritalium liber

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8781SPIRITAL. LIBER. bimus per G H tubum antequam in baſim aqua infundatur, aëre per tu-
bum X O excedente. Poſtea canalem comprehendentes per quoddam
foramen aquam in baſim infundemus, quouſque obſtruamus oſculum O,
& canalem D dimittamus. Manifeſtum igitur eſt vinum non fluere. Pro-
pterea quod aër nulla ex parte ingredi poteſt. Quando autem extremum
regulæ R deprimemus, pars aliqua clepſydræ ex aqua extolletur, & denu-
data reſpiratione O fluet D canalis, quouſque ſublata in clepſydra aqua
effluens ipſam O reſpirationem obſtruat. At ſi rurſus repleta clepſydra
extremum regulæ R pluſquam antea deprimatur longiori tempore effluet
ſublata in clepſydra aqua, & ob id ex canali plus vini educetur. Si vero
tota clepſydra extollatur, multo magis effluet. Neigitur manu deprima-
mus extremum regulæ R, ſit quoddam pondus V in exteriori regulæ par-
te R Q delatum: & quando fuerit propè R totam extollet clepſydram,
quando vero remotius minus extollet. Itaque experientia invenientes
menſuras, quas volumus canalem D fluere, inciſiones faciemus in regula
R Q, & menſurarum deſcriptiones. Quare cum volumus partem aliquam
effluere, adillas inciſiones pondus deducentes fluere dimittemus.

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81	75
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