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Fourth attempt at a furnace

(Click to enlarge photo)

This furnace was constructed out of an old digger bucket. Although the furnace worked well, the stack of cast-iron heat-exchangers easily became clogged with tar, and our old friend 'automation' was clearly going to be a big problem again because I wanted to recycle waste paper and cardboard and had under-estimated the problems involved. By now gasifiers had caught my attention anyway and I wanted to give a lot more time to them.