History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c13.s2.t4.77

v1.c13.s2.t4.77

This value decreases to 358 cm³ in the case of the modern furnace because of the indirect reduction promoted in the stack and also higher temperature and productivity attained in this furnace. The decreased size of the mouth of the furnaces indicate that the ancient craftsmen were conscious of the importance of gas-solid contact time and the control of gas velocity inside the furnace. All these design Geometrical Outline of the Furnace.