thomas rubino wrote:Hi Peter;
I rarely have reason to want to cover the feed tube until the end of the burn.
Is there a reason you think it works better?
Occasionally during start up of my shop stove I have some smoke back , but it has a bell not a piped mass.
Our 8" J in the studio with a piped mass only gets bricks at the very end of the burn.
Your metal box , I suspect would heat up over a few hrs and you might have issues with it igniting wood up high in the feed tube.
Gerry Parent wrote:You've come a long ways my friend! That photo belongs on the cover of Good RMH magazine. Well done to the whole team!
Satamax Antone wrote:Some chalk in the brick transformed into quicklime? Doubtful. But hey, that could be an explanation!
Or it's hydrogen! Throw a match in there!
Gerry Parent wrote:My take on it is much less exciting than you fellows proposed but I would hazard a guess and say it was your super dry brick sucking up all that water and creating bubbles.
I know I have seen this happen when I put chunks of dried cob from a rmh rebuild into water and it bubbles for quite some time afterward.
Satamax Antone wrote:Peter, in France, we used to have a "hache paille"
But far more basic, with just a board with a ledge, and with a sort of huge knife, with a hook at the end.
Just like this one, for example.
They used to recycle old scythe for this. Making the end into a sort of metal rod, and bending it to form a hook, which would in turn fit in a ring at the end of the board.
And a far more modern way!
Or even newer!