Michael Cox wrote:The charred material will build up in sucessive layers over time, so in one burn you could in theory end up with a cone totally full of char.
Yes, but that's just because of the opening. A larger barrel or a bigger pit would allow the same thing. A bigger container holds bigger pieces of wood.
Michael Cox wrote:Second, the sloped sides make it nice and easy to toss in longer and more uneven pieces of brush wood/hedge trimmings etc... less processing of the wood makes life a lot easier and quicker.
Michael Cox wrote:Open top barrels don't work well because the steep sides restrict airflow so the gases given off cool significantly before they burn near the top of the barrel. The open pitch should give better air supply to the compustion surface so the gases will burn hotter and more completely.