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Untitled-2666...Gareth Moore, sealing up the back door of No1 furnace

A 4 inch wall of clay is the first seal, then a 6 inch wall of damp packed sand made by the floor moulders just for this job. Then a steel plate covers the opening which is locked tight to the furnace by the double bars to the left of the picture. Get this wrong and the iron come`s out the back as well as the front.