Labels:text | screenshot | font OCR: Leonardo writes that smoke, like water, moves at first fast, and then more slowly because "it becomes colder and heavier, owing to the fact that a great part of it is condensed through the parts striking against each other and being pressed together and made to adhere one to another." A Leonardo's comparison of the elements is made explicit in the text where he mentions Heron of Alexandria's steam-driven rotating ball, the Eolipile, as a demonstration of applied pressure created by heat. He compares this
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