How rising water thins; a two-braccia waterfall diagram
Red-chalk hydraulic studies of falling and rising water, keyed m, n, a, q, p, o
A red-chalk leaf, drawn upside down, with two hydraulic notes and their diagrams. The first states that water continuously raised by the motion of other water grows thinner the longer that raised column is compared with the water driving it. The second, keyed with the letters m, n, a, q, p, o, works out that adding water above a two-braccia fall reduces the effective drop. Mound-and-water shapes are sketched to accompany the reasoning.
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Water raised by the motion of other water grows thinner
Water that rises continuously because of the motion of other water becomes as much thinner than the water that moves it as it is longer. The longer the raised stream, the more slender it is relative to the driving water.
Adding water above a two-braccia fall reduces the drop
If the water n a, p o has a fall of two braccia, then adding the water n m, p q above it means it will no longer have as much fall. The lettered mounds map where each portion of water sits along the descent.