Two water currents contending: an eddy at their meeting
A flow from a and a flow from c converge at b, where 'a b prevails'
A schematic shows two currents—one beginning at a, the other at c—converging to raise an eddy at their junction b, annotated 'a b prevails.' A larger, more detailed drawing renders the conflux of two great flows producing turbulence where they meet. Leonardo notes that here two powers of water contend, now the one prevailing, now the other.
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Eddy where two currents meet
In the schematic, a current from a and a current from c meet to produce an eddy at point b; the annotation reads 'a b prevails.'
Two contending powers of water
A detailed study of the conflux of two great flows shows turbulence at their conjunction, with the note that here two powers of water contend—now one water prevails, now the other.