Canal lock: chamber dimensions and gate mechanism
A lock (conca) 50 braccia long, its gates, hoisting screws and a mason's plumb-level
The upper band of the sheet shows a long view of a piled, battlemented lock wall or embankment, above which a note gives the lock's measurements: 50 braccia from one gate to the other, 10 braccia wide at the top, 9 at the bottom and 6 high, with the instruction that all the timbers be charred and blackened by fire. Below are detailed studies of a lock gate for a conca, its screw-and-windlass hoist and a plan of the gate, together with a small barred grid. A caption at the upper right corner names a mason's plumb-level (archipenzolo).
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Dimensions of the lock chamber; timbers charred against rot
The lock measures 50 braccia from one gate to the other, 10 braccia wide at the top, 9 wide at the bottom and 6 high. Leonardo adds that all the timbers should be charred and blackened by fire, a treatment to protect the submerged woodwork.
Gate for a lock, with its hoisting mechanism
A study captioned gate for a lock shows the gate together with a vertical screw-and-crank hoist and a windlass, drawn both in elevation and in plan at the lower part of the sheet. A small barred grid appears alongside.
Mason's plumb-level (archipenzolo)
A caption in the upper right corner names an archipenzolo, the A-frame plumb-level used to check the level of masonry and timber work on such a construction site.