Bessemerconverter. Image from "Discoveries & Inventions of the Nineteenth Century" by R. Routledge, published 1900. source: en:Image:Bessemer converter
Attribution-Share Alike 2.0 Generic license. Attribution: The last BessemerConverter in England by Neil Theasby You are free: to share – to copy, distribute
Commons Attribution-Share Alike 2.0 Generic license. Attribution: BessemerConverter, Kelham Island, Sheffield by Stephen Richards You are free: to share