Grinding mill with a bladed rotor over a geared base
The wheel that holds the wooden wheel above the stone one
Drawn with the sheet turned upside down, the leaf studies a grinding mill: a large horizontal rotor with radial blades set above a domed, legged housing that encloses gearing, with fainter repetitions of the same machine sketched at the top and a broad basin below. A note beside the conical part explains that the projecting strip shown is the piece that holds the wooden wheel above the stone one. Additional mirror-script notes appear on the sheet that were not transcribed.
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Catch holding the wooden wheel above the stone
A strip projecting from the conical part of the millstone assembly is identified as the element that stops or holds the wooden wheel above the stone wheel, controlling how the two grinding surfaces meet.
Bladed rotor and geared housing
The central mechanism is a large horizontal wheel carrying flat radial vanes, mounted on a vertical shaft that descends into a domed base standing on legs and enclosing the gear train. The same arrangement is repeated in fainter sketches above and to the right.