History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c13.s2.t4.100

v1.c13.s2.t4.100

| Operation | Time | Material Ore | charged Coal | Blowing Rate | Remark |
| **Jiragora Furnace** | | | | | |
| 1. Furnace Preheating | 1 hr | | 8 kg | Faster than 87 strokes/min. | See Table VI |
| 2. Reduction stage | 4 hrs | | 14 kg | 87 strokes/ min. | Sequence of ore and coal charging not available. |
| 3. Consolidation stage | 1 hr | | 8 kg | Vigorous blowing | |
| 4. Total operating time | 6 hrs | | | | |
| 5. Total material charged and metal produced | - | 24 kg | 30 kg | | 5.6 kg of iron |
| **Bishunpur Furnace** | | | | | |
| 1. Furnace Preheating | 1.25 hrs | 2.5 kg | 3.25 kg | 40-50 strokes/min. | Fce. Temp. 550 ° C |
| 2. Reduction stage | 4 hrs. | 8 kg | 16 kg | 60-70 strokes/min. | -950 ° C |
| 3. Consolidation stage | 0.5 hrs. | 1 kg | 2 kg | 110 strokes/min. | 1500 ° C |
| 4. Total operating time | 5.75 hrs. | - | - | | 2.5 kg of iron |
| 5. Total material charged and metal produced | - | 11.25 kg | 21.5 kg. | | |