A crank that turns a wheel one way; a floating ship
Reciprocating handle giving continuous rotation, and water displaced by a hull
Two ideas share the sheet. A mechanism is described in which a handle, turned or swung now one way and now the other, always drives a wheel in a single direction, drawn as a framed toothed wheel with a crank and a rocking linkage. Above it a hull floats on a waterline, lettered a, m, n, illustrating the principle that a floating ship displaces exactly its own weight of water. A fixed point in the drive is labelled 'immovable pivot.'
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Handle that drives a wheel always one way
Leonardo notes motions in which a handle, turned or swung now this way and now that, makes a wheel go always in one single direction. The framed toothed wheel with its crank and rocking linkage below realises the idea.
A floating hull displaces its own weight of water
As much weight of water is driven from the place where the ship settles floating as is the ship's own weight. The hull is drawn on a waterline and lettered a, m, n.
The immovable pivot
A fixed point in the drive train is labelled 'immovable pivot,' about which the rocking members turn.