To fire a forge, all clinkers are first removed and some inflammable material, such as wood shavings or oil waste, is selected and placed on the hearth over the tuyere. The fuel should be the best quality soft coal thoroughly moistened, so that it will coke or stick together when heated. Coal containing hard spots will cause an uneven fire. The fuel is carefully placed around and over the ignitible material, leaving one opening on the top for the draught, and one in front for the placing of the metal to be heated. After the material is ignited the proper draught is applied until the coal catches. The fire is shaken occasionally in order to maintain a live and even heat. If this is not done, the interior burns out, leaving a hollow space which is worthless for heating. When necessary the fire is banked by covering it with fine, damp coal.