The diagram below is a schematic view of the bessemer converter, invented in 1855: which sentence describes the way in which this object was used?

Steel production--the Bessemer process and the converter created by him turned iron into steel. 

This process removed the impurities which causes iron to be weaker than steel. Andrew Carnegie is credited with bringing the Bessemer process to the US and making the US the number 1 producer in steel for about a century.

James wattrichard arkwright eli whitney thomas edisonnicolaus otto