History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c13.s4.20

v1.c13.s4.20

The forging of the Dhar Iron Pillar has shown a technological process of manufacturing somewhat similar to that used for the manufacture of the iron cannon. Prakash (1989-90) has studied and analysed the technique of manufacture of the Dhar Iron Pillar. *Fig. 54* shows a schematic drawing giving details of the joint of two iron blocks by the use of a tapered pin as envisaged by Prakash. The joint of the two blocks has been reinforced by butt welding of iron plates from all the sides. *Fig. 55* shows a photograph of the top of the Delhi Iron Pillar and this also shows the signs of hot fitting of a square ring on the circular shaft of the pillar. In the centre of the pillar there is a square cavity supposed to be used for fixing