Du Shi
Du Shi was a Chinese hydrologist, inventor, mechanical engineer, metallurgist, and politician of the Eastern Han dynasty. Du Shi is credited with being the first to apply hydraulic power to operate bellows in metallurgy. His invention was used to operate piston-bellows of the blast furnace and then cupola furnace in order to forge cast iron, which had been known in China since the 6th century BC. He worked as a censorial officer and administrator of several places during the reign of Emperor Guangwu of Han. He also led a brief military campaign in which he eliminated a small bandit army under Yang Yi.
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