Setting aside the finished lid I began preparing the furnace. Before I can mix up some more refractory I needed to make some sort of liner to form the inner chamber of the furnace and locate and add the tuyere so that an air source can be attached. First step, come up with a liner. The book calls for making two wood disks and wrapping a piece of sheet metal around that, allowing the liner to be pulled out after adding the refractory. I decided to use a piece of cardboard tube that I would leave in place and burn out as I cured the liner. The 10 inch diameter of the cardboard tube was a bit large so I cut the tube and choked it down to a 9 inch diameter.
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