Labels:text | screenshot | font OCR: into the shape of a huge column, and becoming thus condensed, the air acquires weight. I once saw such winds, raging around together, produce a hollow in the sand of the seashore as deep as the height of a man, removing from it stones of a considerable size, and carrying sand and seaweed through the air for the space of a mile and dropping them in the water." B Leonardo's illustrated discussion of the human- directed movement of water recalls the city he planned in the wake of the Milanese plague of 1483-84. (His ideas and sketches are recorded
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