Borelli, Giovanni Alfonso - De motionibus naturalibus a gravitate pendentibus

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expreſſio, quæ ab aere efficitur, non ſemper aſſimila
tur ei, quæ ex compreſſione poſtica digitorum crea
tur, veluti prunorum nucleos à digitis poſticè com
preſſis pueri proijcere longè ſolent, vtque aduerſa
rius exiſtimabat, ſed expulſio, & expreſſio flammæ

facta ab aere circumfuſo fit, vt exigit ratio mechani
ca ſiphonis ſursùm inuerſi vt ex elementis hidroſta
ticis conſtat, vtque meliùs inferiùs declarabitur vn
de malè infertur, quòd ſi flamma expulſa eſſet ab am
biente aere, deberet fieri acuminata in eius baſi, &
rotunda in eius vertice.

Cap. 4. poſi
tiuam leui
tatem noņ
dari.

Cap. 2.

PROP. LXXI.

Flamma in ſpiritu vini accenſa non debet ab aere incum
bente contundi, cùm ab eius pondere non exprimatur
ſursùm, ſed ab aere collaterali infernè reflexo.

POſtrema inſtantia, quòd aer flammæ ſuperincun
bens potiùs eam deberet contundere, & dila
tare, & deorsùm eam diuerberare, non autem in acu
tiem ſublimare, facilè ſoluitur, quia aer fluidus non
ſolùm ſupremus, & flammæ incumbens, ſed etiam̨
lateralis, & infimus ob eius grauitatem ad modum̨
ſiphonis, vel libræ non poteſt contundere flammam,
ſed eam ſursùm exprimere, & impellere debet, at
que aer ſupernus neceſſariò ad latera excurrere de
bet, & tranſitum minùs ponderoſæ flammæ aſcenden
ti concedere; nec obſtaculum aliud ei inferet, præ
terquàm contuſionem ſupremæ aciei flammæ, vt ni-

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