Labels:text | screenshot | font OCR: Leonardo continues his interest in controlling the flow of rivers, and he gives indications here that his observations involve more than just watching a river from a boat. In one passage he proposes an accurate method of gauging the speed of a current. In his time there was no concept of a second hand or a stopwatch. To measure a short-term event, such as the passage of an object bobbing in a swift current, one normally counted by the beats of one's own pulse. Leonardo, an accomplished musician, decided that the beat of musical measure would be more regular
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