Labels:text | screenshot | font OCR: Leonardo uses geometry to explain how the intersection points of two expanding circular waves lie on a single line and do not shift off that line as the waves grow. The diagrams here are basic compass constructions requiring only an elementary knowledge of geometry. B The text then shifts back to the general action of waves, but transfers them from the element of water to a consideration of how waves of sand form on river bottoms and how waves form in the air. This establishes the validity of the wave principle in three of the four elements.
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