The canal mouths high and low: where the water flows
Two sections a b c d showing intake-mouths at the bottom and near the surface
Two diagrams show the slope of the Naviglio with its little mouths (bocchelli), first set at the bottom, lettered a b c d, and then near the surface. The note reasons that with mouths at the bottom all the water a b enters the canal, while with mouths near the surface only a c enters; the still layer c b then has no exit, does not move, admits no further water, and instead runs off by the Ticino. The page carries mirror-writing above two ruled diagrams marked with small squares for the mouths.
On this page
Slope of the canal with mouths at the bottom (a b c d)
The first figure shows the pendent slope of the canal with its little mouths set in the bottom, lettered a b c d. With the exits at the bottom, all the water a b is that which enters the canal.
Mouths near the surface: the dead layer c b
With the little mouths near the water's surface only the water a c enters the canal; the water c b, having no exit, does not move in quantity, and not moving admits no further water but runs off by the Ticino.