This is the test burn for our Rocket Mass Heater, which will be the source of heat in our cob home. Fore those who don't know much about RMHs, they are fed vertically with small scraps of wood and burn almost entirely clean (no smoke).
The barrel is a 55 gallon drum that will set over the top of the firebrick chimney and re-burn all the smoke from the fire. The heat is then transferred into a cob bench and in turn heat the house. More photos to come of the build process.