Water Speeding Through a Narrowed Channel
Falling water gains speed at a constriction; a depression forms in a water surface
This leaf studies the motion of water. A note explains that water dropping from a narrow channel into a wider space becomes faster in proportion to how far it falls relative to its own thickness, shown above by streamlines that draw together and cross as they squeeze through a throat. A second heading, left without accompanying text, labels the lower drawing of a hollow or depression forming in a body of water.
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Water accelerating through a constriction
Leonardo states that water falling from a narrow channel into a wide one moves faster the greater the height of its fall compared with its own thickness. The upper sketch renders this as streamlines that draw together and cross at a narrow throat before spreading out again.
A depression in the water surface
A heading marks a study of a hollow, or sagging, in a mass of water. The lower drawing shows a curved surface profile that dips and rises as it meets a vertical boundary at the right.