Light-ray diagram; the force of falling water and a mill paddle
A labeled ray diagram; questions on the percussion of falling water and raising a mill paddle
At the upper right a labeled diagram of light rays passes through a lens-like figure, marked with the points a, c, e, g and b, d, f. Two notes on water follow. The first asks whether the percussion of water striking an object equals in power the weight of the whole quantity of water that strikes, whether that water is in the air or not. The second asks which is easier: to raise a mill's paddle in running water, toward one side, the other, or across, or in still water. A small curved form is sketched below the diagram.
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Diagram of light rays (a, c, e, g, b, d, f)
A geometric figure at the upper right traces light rays through a lens-like shape. The transcription supplies only its labeled points, a c e, g, and b d f, with no explanatory text.
Does a waterfall's percussion equal the water's weight?
One note poses whether the percussion made by water on its object equals in power the weight of the whole quantity of striking water, and whether that water is found in the air or not.
Raising a mill paddle in running versus still water
A second note asks which is easier: to lift the mill's paddle in running water, toward one side, the other, or across it, or in still water. A small paddle-like form is sketched at the right.