This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Siemens's direct reduction continuous furnace. Rduction directe invent par Carl Wilhelm Siemens Le systme de chauffe de ce four rverbre est gauche Le minerai mlang au charbon est charge droite Le laitier coule continuellement par un trou le mtal est coul intervalles rguliers Carl Wilhelm Siemens The heating system of this openhearth