Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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<
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<
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">De motu fluidorum, quæ non proprio pondere,
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ſed potentia aliena ejiciuntur, ubi præſertim de
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Machinis Hydraulicis earundemque ultimo qui da-
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ri poteſt perfectionis gradu, & quomodo mecha-
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nica tam ſolidorum quam fluidorum ulterius perſici poſsit.</
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<
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">IN hâc ſectione, qua Machinas examinare hydraulicas, uſumque
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earum, quantum fieri poteſt, perficere potiſſimum conſtitui,
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animum abſtrahemus à variationibus motus, quæ originem du-
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cunt à potentia vel inertia fluidi interni, quia ut vidimus mo-
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tus aquæ internæ tantum non æquabilis eſt à primo fere fluxus initio, ſi ori-
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ficium exile ſit, uti eſt in Machinis hydraulicis plerisque ratione amplitudi-
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num internarum. </
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<
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">Res enim foret ridicula in rebus practicis ſollicitos eſſe
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de mutationibus, quæ primis fluxus momentis fiunt, quasque jam determi-
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navimus in ſectione quarta, quod ibi operæ pretium eſſe poterat ut omnis
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theoriæ vis inde eluceſceret. </
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<
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">Igitur durante toto motu, brevitatis gratiâ, po-
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nemus aquam conſtanter velocitate expelli, quæ ſe habeat ut radix potentiæ
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internæ prementis, poſtquam hæc potentia ad pondus cylindri aquei foramini
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ſuperincumbentis reducta fuerit: </
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">nam quæcunque fuerit iſta potentia, con-
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ſiderandum erit pondus cylindri verticalis aquei ſuperficiei aqueæ internæ ſu-
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perincumbentis, atque altitudo iſtius cylindri dabit altitudinem velocitati
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aquæ exilientis debitam, ſi modo nulla adſint obſtacula extrinſeca, & </
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<
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">aqua
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ex@vaſe ampliſſimo ejiciatur. </
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<
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">Hoc ita intelligendum eſt, ut ſi operculum
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A B pondere P oneratum (Fig. </
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dus autem P æquale ſit ponderi cylindri aquei H A B I, tunc vena aquea F G
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altitudinem H I attingere debeat.</
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