II. Reviving of iron in a stück, or wulf's oven III. Reviving of iron in a blue, or cast oven IV. Reviving of iron in various blast furnaces a. Blast furnace in the Hartz Mountains, Germany b. Blast furnace at Malapane, Silesia c. Blast furnace for smelting bog ore d. Blast furnace for smelting spathic ore, Styria f. Blast furnace in Saynerhütte, Germany y. Number of charges z. Number of tuyeres required in a furnace bb. Quality of iron depending on the tuyere dd. Quality of iron depending on flux ff. Scaffolding in the furnace gg. Flame of trunnel-head hh. Appearance of melted iron |