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Library/Paris Manuscript G/186

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Paris Manuscript G — 186

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Bibliothèque de l'Institut de France, Paris

Acqua.

L'acqua corrente ha in sé infiniti moti, maggiori e minori che 'l suo corso principale. Questo si prova per le cose che si sostengano in fra le 2 acque, le quali son di peso equale all'acqua, e mostra[n] bene nell'acque chiare il vero moto dell'acqua, che le conduce, perché alcuna volta la caduta dell'onda in verso il fondo le porta con seco alla percussione di tale fondo, e refretterebbe con seco alla superfizie dell'acqua, se 'l corpo notante fussi sperico; ma ispesse volte nol riporta, perché e' saria1 più largo o più stretto per un verso che per l'altro; e la sua innuniformità è percossa dal maggiore lato da una altra onda refressa, la qual va rivolgendo tal mobile, il quale tanto si move, quanto ell'è portato; il qual moto è quando veloce e quando tardo, e quan[do] si volta a destra, e quando a sinistra, ora in su e ora in giù, rivoltandose e girando in se medesimo, or per un verso e ora per l'altro, obbidendo a tutti i sua motori, e nelle battaglie fatte da tal motori sempre ne va per preda del vincitore.

Dell'onde sono create dal...

Water.

Running water has within it infinite motions, greater and lesser than its principal course. This is proved by the things that are suspended between the two waters, which are of equal weight to the water, and which show well in clear water the true motion of the water that carries them; for sometimes the fall of the wave toward the bottom carries them with it to the striking of that bottom, and it would rebound with them to the surface of the water, if the floating body were spherical; but often it does not carry it back, because it would be broader or narrower one way than the other; and its unevenness is struck on the larger side by another reflected wave, which goes turning that moving body, which moves as much as it is carried; which motion is now swift and now slow, and now it turns to the right and now to the left, now up and now down, revolving and spinning on itself, now one way and now the other, obeying all its movers; and in the battles waged by such movers it always goes as prey to the victor.

Of the waves that are created by the...

The Infinite Motions Within Running Water

How suspended bodies reveal the true, ever-changing motion of a current

Hydraulics Physics & Mechanics

Under 'Water', this long note argues that running water contains infinite motions, greater and lesser than its main course. Bodies of the same weight as water, suspended between the surface and the bottom, reveal this true motion: a falling wave may carry such a body down to strike the bottom and, were it spherical, bounce it back to the surface, but its unevenness is caught by reflected waves that turn it now fast, now slow, right and left, up and down, spinning it as it obeys each of its 'movers' and falls prey to whichever prevails. The text breaks off beginning a new section, 'Of the waves that are created by the...'.

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Running water holds infinite motions

Running water contains within it infinite motions, both greater and lesser than its principal course. These hidden currents can be detected through bodies suspended between the surface and the bottom that share the water's own weight and so drift with its true motion.

Suspended bodies tossed by competing waves

A falling wave may carry a neutrally buoyant body to strike the bottom and, if it were spherical, rebound it to the surface; but its uneven shape is caught by a reflected wave on its larger side, turning it now swift now slow, right and left, up and down, spinning on itself. It obeys all its 'movers' and, in their battles, goes as prey to the victor.

Reader's Edition — described with AI from the e-Leo transcription.