Mill of the Doccia at Vinci and a colour-grinding machine
A water-mill and a porphyry mill for grinding pigments with water, 100 pounds
The sheet pairs two milling devices. At left, drawn with the sheet turned upside down, is a mechanism captioned as the mill of the Doccia at Vinci, with a vertical shaft, a horizontal bladed wheel and a hopper. At right is an instrument for grinding colours with water, rated at 100 pounds, whose grinding-stones (macinelle) are to be of porphyry dressed by percussion so that they clean themselves as they turn.
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Mill of the Doccia at Vinci
The left-hand device, sketched with the sheet inverted, is labelled as the mill of the Doccia at Vinci. It shows a vertical shaft carrying a horizontal set of blades or vanes, a funnel-shaped hopper and a base assembly with wheels.
Machine for grinding colours with porphyry mullers
The right-hand instrument is annotated for grinding colours with water, rated at 100 pounds. Leonardo specifies that the grinding-stones be of porphyry, dressed by the blow, so that the device cleans itself as it turns.
Grinding of colours driven by water
The colour mill is intended to work 'ad acqua', with water, and the left-hand mill is fed from the Doccia, a water-chute at Vinci. Both devices harness flowing water as the motive power for grinding.