Keywords: Blast furnaces Middlesbrough.jpg Blast furnaces at Bell Brothers' Port Clarence Works Stockton-on-Tees County Durham England from page 188-189 of The Principles and Practice of Iron and Steel Manufacture Walter Macfarlane 1917 Hauts fourneaux de Port Clarence Works des Bell Brothers Stockton-on-Tees County Durham Angleterre http //www archive org/details/principlespracti00macfrich California Digital Library 1917 Borvan53 PD-old-70-1923 Images from The principles and practice of iron and steel manufacture by W Macfarlane Industrial blast furnaces |