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| The cobb was tapped down from the top with a wooden block to eliminate gaps in the walls. In the end all this downward force proved problematic. The position of the tuyere, orginally set to create a 'hot spot' about 15 cm above the smelter floor, would be shifted downwards. Previous Text © Darrell Markewitz, 2017 Photographs © Karen Peterson, 2017 Copyright details Contact us | ||