The members of this mailing list actively discuss the production of charcoal from large pieces of wood. This problem is important for those countries of Asia and Africa, where there is a lot of
wood, a lot of working hands and few environment regulations. I think, it is better to offer a solution now than to wait for an ideal solution some time in the future.
I offer a variant of such a furnace.
This design is not protected by the patent so anybody can use it, where regulations permit.