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.
There were millions of the little blood suckers. But thanks to this tiny ad, I wasn't bitten once.
Devious Experiments for a Truly Passive Greenhouse!https://www.kickstarter.com/projects/paulwheaton/greenhouse-1