Human beings have eaten wheat flour since the Neolithic ages. The tool that allowed him to obtain this flour was the hand mill or the traversing mill.
The hand mill evolved to become the rotary mill that consisted in two flat circular slabs placed on top of each other that milled the kernel by the friction produced by the upper slab rotating on the lower one.
The manual rotary mill evolved in terms of its dimensions, structure and operating mechanisms. Depending on the source of energy they used, the mills were called: blood mills, windmills, hydraulic mills or fire mills.