CHAPTER XII.
Production of a knife--Manufacture of iron--Raising coal--The hot-blast--Iron bridges--Rolling bar-iron--Making steel--Sheffield manufactures--Mining in Great Britain--Numbers engaged in mines and metal manufactures 139
Production of a knife--Manufacture of iron--Raising coal--The hot-blast--Iron bridges--Rolling bar-iron--Making steel--Sheffield manufactures--Mining in Great Britain--Numbers engaged in mines and metal manufactures 139