History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c13.s4.10

v1.c13.s4.10

The technique of wire drawing using hardened steel dies or die plates having hair like fine holes has been in use for ages and even today the jari manufacturers of Varanasi and Gujarat are skilled in producing their own dies instead of using the modern diamond dies and machines. The wire manufacturers had the idea of work hardening and annealing to soften the material by recrystallization and grain growth.