A more logical version is that they were moved to the site on stone rollers.
2.
Wheat was kiln dried in the loft, heated through a perforated floor, and then ground into flour by stone rollers driven from the mill wheel.
3.
In Ms . Hartung's tortilla factory, piles of masa are balanced precariously atop stone rollers attached to the tortilla machine _ a whirring contraption of chains and steel belts.
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