National Geographic : 1946 Apr
British Press Service With a Bamboo-handled Rod, an Indian Worker Diverts Slag from a Blast Furnace's Fiery River ofIron To force the fire, the large pipe overhead conveys preheated air in the Tata Iron and Steel Company at Jamshedpur. Inthe blast, iron ore and limestone are fused by coke. Top slag, formed by stone's union with ore's impurities, has already escaped through the trough (right).Now the residue floats on astream ofiron (left). The heavier metal runs on; its crust is poled into the stream on the right (page 519).