Keywords: Steel melting house Sheffield.jpg crucible steel Samuel Osborne Co Sheffield fr Halle de refusion de l'acier où était élaboré l'acier au creuset Samuel Osborne Co Sheffield http //www archive org/details/principlespracti00macfrich California Digital Library 1917 Walter Macfarlane PD-old Images from The principles and practice of iron and steel manufacture by W Macfarlane Crucible furnaces Steel industry in Sheffield Military industries and wartime industrial production in World War I era |