Grinding mill, paddle-wheel beam frame and channel profile
Red-chalk sketches of a mill with wall, sluice and millstone, a paddle-wheel frame, and a flow note
The inverted leaf gathers several mechanical and hydraulic sketches in red chalk. One diagram lays out a grinding-mill installation labelled wall, sluice-gate and millstone; a timber framework of beams carries paddle wheels; and a channel profile lettered a, b, c accompanies a note on how surface water moves. Leonardo remarks that the part of the water joined to the air moves with the air's course, even while the bottom current runs the opposite way.
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Grinding-mill installation: wall, sluice-gate, millstone
A diagram labels the parts of a grinding-mill installation: the wall, the sluice-gate (serratoio) and the millstone (mola). It shows how the water passage is controlled to drive the stone.
Framework of beams carrying paddle wheels
A timber trestle framework of crossed beams is sketched carrying paddle wheels, forming the support and driving members of a water-powered machine.
Surface water follows the air against the bottom current
A channel profile lettered a, b, c accompanies the note that the part of the water joined to the air moves with the course of that air, even though at the bottom it runs in the opposite direction.