Intersecting Jets of Water and Wine
How two equal streams pass through one another unchanged
A red-chalk page on how two streams of water interpenetrate, headed by overlapping sets of concentric circles that show wave-rings crossing one another. A lower sketch shows intersecting jets, labelled water and wine or tinted water so their paths can be told apart. Leonardo's note states that waters of equal course and descent, moving one against the other, penetrate and pass through each other without abandoning their natural course.
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Equal streams pass through each other unchanged
Waters of equal course and descent, moving one against the other, penetrate and pass through one another without removing their natural course. To make the crossing visible, one jet is marked water and the other wine or tinted water.
Overlapping rings of concentric ripples
At the top of the leaf two sets of concentric circles are drawn so that they overlap, showing how expanding wave-rings cross one another. The sketch complements the note on interpenetrating streams below.