Winding beam that raises one weight as it lowers another
A round beam wound with two cords, and a cord-and-pulley weight system marked 8 4 8
The upper drawing shows a round beam wound with two cords so that, as it turns, one weight rises while the other descends, a simple differential windlass. Below it a cord runs over a pulley to suspend weights, annotated with the figures 8 4 8. Both figures continue Leonardo's study of how weights balance across cords and turning members.
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Round beam wound with two cords
A round horizontal beam has two cords wound about it, arranged so that turning the beam raises one hanging weight while lowering the other. The device works as a differential winding drum for lifting loads.
Cord-and-pulley weight system marked 8 4 8
A cord passes over a pulley to carry weights whose values are noted as 8 4 8. The arrangement studies how the loads distribute across the cord and pulley in equilibrium.