1 | Glimmers of hope, meet your guiding light: the blast furnace. | |
2 | Wawan said the new plant uses blast furnace technology claimed to be low cost. | |
3 | Coking coal is used, together with iron ore, in blast furnaces to manufacture steel. | |
4 | Massive steel ducts snake from the blast furnaces and surrounding buildings. | |
5 | It began about the middle of the 19th century , when the blast furnace came into use . |