Water, waves and sand around a stone
Red-chalk studies of a stone in a stream with sand deposited behind it
Three red-chalk figures study a stone lying in moving water. Leonardo marks a stone 'a' behind which sand collects, notes the waves above, and observes that from f the water turns back toward a; a further figure of pebbles is labelled 'clean sand'. Additional faint red-chalk writing appears on the sheet beyond the transcribed captions.
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Water turning back behind a stone
A stone sits in the current with waves marked above it. From f the water turns back toward a, forming the eddy behind the obstacle; the figures are keyed f and a.
Sand deposited behind the stone
At a, behind the stone, sand (rena) comes to rest, and a related figure of pebbles in water is marked 'clean sand'. The notes track where sediment gathers around an obstacle in the stream.