Eddies in a river and a gravel bed
Where whirlpools form between the water's leap and its banks
In pen and red chalk Leonardo studies whirlpools (retrosi) in flowing water and a river running over gravel. One small pen sketch of an eddy is marked 16. He notes that the eddies which occupy the middle of the width of a fall of water form between the leap of the waters and their banks.
On this page
Eddy study, marked 16
A small pen drawing sets down a single eddy (retroso), numbered 16. It heads the page's studies of whirling water.
Where eddies form in a fall of water
Leonardo notes that the eddies occupying the middle of the width of a fall of water will lie between the leap (rebound) of the waters and their banks. A red-chalk river with gravel accompanies the observation.