Mills in the time of Agrigentum

Mills were machines used by the Romans to transform wheat into flour.
Though the existence here of water mills also in previous times has been ascertained, those found in the town in question were all made of lava stone and placed inside the tabernae.
The grindstones had a circular brickwork base consisting of the meta, a conical stone, on which rested and rotated the catillus, a biconical hollow stone, operated by human or animal force.