Hydraulic conduit with a filling-and-emptying sequence
A compartmented channel and arcaded structure, with a note on opening and closing sections
A red-chalk channel divided into labelled compartments (a b, n m, t r) runs across the top of the sheet, with an arcaded structure drawn in perspective below and a plan beneath it. The note reads as an operating sequence for hydraulic conduits: when r t empties, m n is walled up, and when n is at m, a passes into b and t is raised. The scholarly identification of the drawing as hydraulic conduits is marked as uncertain.
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Sequence for emptying and filling the conduit
The note directs that when r t empties, m n is to be walled up; and when n is at m, a passes into b and t is raised. It reads as a step-by-step control of flow through the conduit's compartments.
Compartmented channel and arcaded support
The upper channel is subdivided by cross-hatched sections that act as gates or bays, while a row of arched piers is drawn in perspective below. Together they suggest the physical conduit and its supporting structure.