Balance with weights and the curved rebound of water
A pen weighing diagram above a red-chalk study of rebounding jets
The upper part of the leaf carries a pen diagram of a balance: a horizontal beam over two wheels or pulleys, marked with the weights 40 above and 20 and 20 below. Beneath it a red-chalk fan of lines studies how water rebounds after striking, lettered S, a, t, r, o, m and n. The note explains that the rebounding lines do not run straight but bend into a curve: the jet from S toward a would rise to m, but the lines t, r and o strike against it and twist it downward to n.
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Rebounding water bends into a curve
The lines of water that leap up after striking do not follow a straight course but incline into a curve. The impact carried from S to a would rise to m, yet the interfering lines t, r and o strike it and twist it downward to n.
Balance loaded 40 against 20 and 20
A beam is drawn resting on two wheels or pulleys, a weighing arrangement noted with the figures 40 at the top and 20 and 20 below. The device sets a single load against a divided one.