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Pressio non propagatur per Fluidum secundum lineas rectas, nisi ubi particulae Fluidi in directum jacent.
Si jaceant particulae a, b, c, d, e in linea recta, potest quidem pressio directe propagari ab a ad e; at
ab ulterioribus l & m easque premant, & sic deinceps in in∣finitum. Pressio igitur, quam primum propagatur ad particulas quae non in directum jacent, divaricare incipiet & oblique pro∣pagabitur in infinitum; & postquam incipit oblique propagari, si inciderit in particulas ulteriores, quae non in directum jacent, ite∣rum divaricabit; idque toties, quoties in particulas non accurate in directum jacentes inciderit. Q.E.D.
Corol. Si pressionis a dato puncto per Fluidum propagatae pars aliqua obstaculo intercipiatur, pars reliqua quae non intercipi∣tur divaricabit in spatia pone obstaculum. Id quod sic etiam
& interea dum conus ABC, pressionem propagando, urget frustum conicum ulterius degf in superficie de, & hoc frustum urget frustum proximum fgih in superficie fg, & frustum il∣lud urget frustum tertium, & sic deinceps in infinitum; mani∣festum est (per motus Legem tertiam) quod frustum primum defg, reactione frusti secundi fghi, tantum urgebitur & pre∣metur in superficie fg, quantum urget & premit frustum illud secundum. Frustum igitur degf inter Conum Ade & frustum fhig comprimitur utrinque, & propterea (per Corol. 6. Prop. XIX.) figuram suam servare nequit, nisi vi eadem comprimatur undique. Eodem igitur impetu quo premitur in superficiebus de, fg conabitur cedere ad latera df, eg; ibique (cum ri∣gidum non sit, sed omnimodo Fluidum) excurret ac di∣latabitur, nisi Fluidum ambiens adsit, quo conatus iste co∣hibeatur. Proinde conatu excurrendi premet tam Fluidum ambiens ad latera df, eg quam frustum fghi eodem impetu; & propterea pressio non minus propagabitur a lateribus df, eg in spatia NO, KL hinc inde, quam propagatur a superficie fg versus PQ.Q.E.D.