Limestone rubble is used inside the "neck" and a few leftover chunks are lying on the deck. And the special Mudfire shape-shifting tool.
Hat on! Have I mentioned this before? Mitch brought over the lid to a discarded cattle feeder, I think it was used for dispensing minerals. Way in the distance a disc coulter from Mitch that was tried and abandoned as a heat diffuser, most likely mentioned during last Spring's ramblings.
The idea behind the Hat is to retain heat. More on this in subsequent episodes. Right now the element causing consternation is the fuel input port. See that corrugated chimney to the left? That's not a chimney. It's a metal hole that directs the fuel into the burn chamber. Problem is, that heat rises: Doesn't take very long until the fuel input chamber is getting pretty dang hot, converting the input tube into an exhaust port. I expected trouble with this design but had to try it anyway. Most all of the hippie drawings on the Internets feature such a fuel delivery device. Whatever.
After taking this photo, I turned on the hydrant and gave the ad-hoc chimney a good soaking before the baling twine burned away.
I have exactly two left-over split firebrick plus the four comprising the shelf at the front of the deck. And a thick-ish plate of steel that's maybe three feet by 18 inches. Let's see what I can do with the next fuel/air intake port... stay tuned.
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