In the year 31 AD , the engineer and Prefect of Nanyang , Du Shi ( d. 38 ) , applied a complex use of the water wheel and machinery to power the bellows of the blast furnace to create cast iron .
In the year 31 AD , the engineer and Prefect of Nanyang , Du Shi , applied a complex use of the waterwheel and machinery to power the bellows of the blast furnace to create cast iron .