The first kiln firing failed quite badly. First of all it seemed to be going great, 200C/h up to about 800 which then stalled out wavering between 820-850 although it got up to 900 when the wind was blowing well. Made me thing the stack is much too small. Quickly grabbed some other bricks and put them on the stack. It then climbed to 950 and sat there. I tried everything to get it to move higher but nothing would work, more gas, less gas, bung in the top out and every burner position.
As it was getting hot the stack moved apart, or the heat just showed the gaps in the bricks and I think I lost even more of the pull.
Pots look like the have some good body reduction from me messing around with the gas too much at 900.
Going to cement the stack and add a few more layers of brick. Seal it properly into the kiln and probably add a metal tube to that for even more stackage. There was a definite lack of oxygen for the gas. I would have liked to get away without cementing but looks like that is not going to happen.
Hopefully have it working by the new year.