Labels:text | screenshot | font OCR: This is another page concerned strictly with Leonardo's professional activities as a hydraulic engineer. The most interesting facet, perhaps, is his concern with the effects of friction (confregazione) of physical materials in the action of water. It is instructive to compare these findings with his study of incidence and reflection in light, where no mass is involved and friction is therefore not an issue. Here Leonardo makes it clear that the angle of rebound is always less than the angle of incidence because the mass loses power on
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