A jet of water rising after striking an obstacle
Water rises by the percussion it makes against the object set opposite it.
A quick pen sketch shows water issuing from a spout at the top and splaying outward and down in a spray of lines, a cascade breaking against something set in its path. A single line of text, part of it struck through, states the principle: the water rises up because of the percussion it makes against the opposing object. The page carries the folio number and the Bibliothèque de l'Institut stamp.
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Water rising by percussion against an obstacle
Leonardo notes that water mounts upward through the percussion it makes against the object placed opposite it. The accompanying sketch shows the falling stream fanning out into many lines where it meets the obstacle.
Cascade breaking against a body in its path
A spout at the top releases water that spreads into a splaying spray of strokes, depicting the impact and dispersal of a cascade striking an obstacle. The drawing illustrates the percussion described in the note.