Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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expreſſio, quæ ab aere efficitur, non ſemper aſſimila
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tur ei, quæ ex compreſſione poſtica digitorum crea
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tur, veluti prunorum nucleos à digitis poſticè com
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preſſis pueri proijcere longè ſolent, vtque aduerſa
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rius exiſtimabat, ſed expulſio, & expreſſio flammæ
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facta ab aere circumfuſo fit, vt exigit ratio mechani
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ca ſiphonis ſursùm inuerſi vt ex elementis hidroſta
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ticis conſtat, vtque meliùs inferiùs declarabitur vn
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de malè infertur, quòd ſi flamma expulſa eſſet ab am
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biente aere, deberet fieri acuminata in eius baſi, &
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rotunda in eius vertice. </
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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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Cap. 2.</
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PROP. LXXI.
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Flamma in ſpiritu vini accenſa non debet ab aere incum
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bente contundi, cùm ab eius pondere non exprimatur
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ſursùm, ſed ab aere collaterali infernè reflexo.
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<
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">POſtrema inſtantia, quòd aer flammæ
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bens</
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potiùs eam deberet contundere, & dila
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tare, & deorsùm eam diuerberare,
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nõ
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autem in acu
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tiem ſublimare, facilè ſoluitur, quia aer fluidus non
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ſolùm ſupremus, & flammæ incumbens, ſed etiam̨
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lateralis, & infimus ob eius grauitatem ad modum̨
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ſiphonis, vel libræ non poteſt contundere
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flammã
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,
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ſed eam ſursùm exprimere, & impellere debet, at
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que aer ſupernus neceſſariò ad latera excurrere de
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bet, & tranſitum minùs ponderoſæ flammæ
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aſcendẽ-ti
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ti</
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concedere; nec obſtaculum aliud ei inferet, præ
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terquàm contuſionem ſupremæ aciei flammæ, vt ni-</
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