Peter (from Budapest) worked a lot with this, that i will call a masterpiece of Simple efficient stove. More than a hundred cracked for him, before he got the right mixture of clay and chamotte, and the right place of air inlet. Just a handful of small branches can cook 4 liter of water. Unfortunately Peter is not among us anymore :-(
He made what i would call basic research in stove building.
Buckley Rumford Fireplaces
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