Weights on rotating arms and on pulleys
Two lever diagrams comparing weights on a rotating arm (1 2 1) and on pulleys (2 4 4)
Two diagrams study the balancing of hanging weights: in the upper figure weights are suspended from a rotating arm and marked 1, 2, 1, while the lower figure repeats the arrangement with pulleys and the numbers 2, 4, 4. A small numeral 41 stands at the top of the sheet. Faint bell- and disc-shaped sketches appear at the left margin, and dense writing from the following page shows through the paper.
On this page
Weights on a rotating arm (1 2 1)
Weights hang from a horizontal arm free to rotate, lettered with the values 1, 2, 1 to compare their turning effect about the centre. The figure examines the equilibrium of weights on a balance-like beam.
Analogous figure with pulleys (2 4 4)
The lower figure repeats the arrangement using pulleys (carrucole), the hanging weights marked 2, 4, 4. The pulleys redistribute the load and show the mechanical advantage of the arrangement.