As the upper stone rotated on the lower stone, kernels of grain were fed between the two and were pulverized
जनावरांच्या साहाय्याने फिरवल्या जाणाऱ्‍या चक्क्या रोम व रोमन साम्राज्याच्या अनेक प्रदेशांत प्रचलित होत्या.