In message , Tim Lamb
writes
Look up Silsoe incinerator. The agricultural college did some work
optimising the hole size and spacing. They used a raised mesh of some
sort to form a hearth.

http://adlib.everysite.co.uk/resourc...cineration.pdf

They are now banned from use in agriculture but I doubt that extends to
garden use:-)

I make a lot of use of mine for garden clearance and certainly hope they
are never banned. It is essential to get good air flow and a hot burn
otherwise there is a lot of smoke. I have been tempted to run a couple
of lengths of 20mm steel electrical conduit into the bottom of the
barrel and pump air through to liven it up a bit. The idea of raising
the material up on a mesh is interesting, must remember to blag some
stainless mesh off my dad next time I visit.




--
Bill