[Cob] RE: two chamber earth oven

[Mary Lou McFarland]

I was wondering if this design would be similiar to a baking oven that would 
be built in next to the fireplace, like they did in colonial times.  I think 
that I've seen a modified version of that basic design in a bread oven, 
except the small oven chamber was stacked over the firebox instead of next 
to it, as in the colonial fireplace.  Will the chimney go completely down to 
the firebox or just to  the airways that wrap around the  oven?  I'm not 
familiar with rocket stoves so I might be envisoning this all wrong.