History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c14.s1.14

v1.c14.s1.14

Two discs, prepared in this way and coupled face to face, made one pair. Two such discs, one carrying the obverse and the other reverse impressions, were coupled face to face and fixed to each other with the help of tenons. Several pairs of discs, placed one above the other and marked with grooves cutting the outer face of the rims, formed one set. A number of such sets, dried up in sun, were placed one above the other. These were then plastered over with a paste of clay mixed with unhusked grain and then baked in a furnace. However, the central hole of the top disc and so of all discs were left open.