CHECK JANUARY 2013 BLOG ENTRY FOR THE BISCUIT TIN METHOD TO MAKE BIOCHAR.
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Dolph In Australia uses the Moxham to make biochar.
http://hawaiibiochar.com/biochar-burn-de_monstration/
Pit method used to make biochar.
Fom Blue Skys Cone Kiln- technique used in Japan for years.
Another method that doesnt require special equipment,but I think if one had that type of timber (cut to length) it would be better used in the stove!