Heron <Alexandrinus>, Heronis Alexandrini spiritalium liber

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5852HERONIS43[Figure 43] tubum in vas B C, aëre per E F egrediente, qui quidem cum in vas A D
procedat, humorem in ipſo contentum per tubum K L M in labellum ex-
primit: hic autem rurſus in vas B C delatus exprimit ſimiliter aërem, qui
eft in ipſo: atque is rurſus aquam, quæ eſt in vaſe A D exprimit in la-
bellum, & hoc tamdiu erit, quoad aqua, quæ in vaſe A D continetur,
evacuata fuerit. Oportebit autem tubum MLK per os utris eſſe, & omni-
no tenuem exiſtere, ut demonſtratio hæc longiori tempore permaneat.
XXXVII.
Sacelli conſtructio, ut igne accenſo valvæ ſponte aperian-
tur, & eo extincto rurſus claudantur.
Sit prædictum ſacellum in baſi A B C D, ſupra quam arula E D collo-
cetur: & per arulam impellatur tubus G F, cujus ofculum quidem F ſit
intra ipſam arulam, oſculum vero G in ſphæra quadam H comprehen-
datur à centro ipſius parum diſtans: coarctetur autem ſphæra ipſi tubo
G F: ſitque in ſphæra inflexus ſiphon K L M, & valvarum cardines in
partem inferiorem extendantur, & expedite convertantur in cnodacibus,
qui ſunt in baſi A B C D. Ex cardinibus catenulæ in unum coactæ per
trochleam ad vas N X concavum & ſuſpenſum religentur; alteræ vero
catenulæ cardinibus obvolutæ, ſuperioribuſque contrariæ, & in

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