A System of Channels: Equal Slope Gives Equal Speed
Vessels a, b, c filled through channels; equal level and slope yield equal velocity
Drawn inverted in red chalk, the leaf lays out a system of channels feeding vessels, with a labelled a holding a jug, b a half and c a half. The openings e, f and n are to be unstopped at the same instant and the channels kept full. From this the note concludes that water falling from the same level, at equal slope and over an equal length of travel, will move at equal speed. A drawing below shows a channel-beam carrying three funnel-shaped vessels on supports.
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Channels feeding measured vessels a, b, c
The system is set so that a holds a jug (boccale), b a half and c a half, while the openings e, f and n are unstopped at the same moment and the channels held full. A beam carrying three funnel-shaped vessels is drawn beneath.
Equal level and slope give equal velocity
The concluding rule states that water falling from the same level, with equal slope and over an equal length of travel, will be of equal speed.