May 8, 2009
We finished firing the anagama on May 2. We get to unload tomorrow. It was a wonderful and yet stressful firing. Since we started the wood kiln research project, the firings have always been challenging. This time we wanted to do our opacity tests again. We recorded the smoke coming off the stack every 15 seconds for six minutes every hour. This gave us 24 consecutive readings each hour and since we did the test for 24 hours we are able to see that we have been able to keep our air quality good throughout the firing. We did the testing from the time we started seriously raising temperature to our highest temperature. That was the time we were adding the most wood and stoking almost constantly. The challenge was getting good reduction without a lot of smoke. We had a few times that the smoke was so black and thick that we exceeded the desired opacity, but it cleared quickly and looking at all of the readings, the testing shows we are well within the 20% opacity range.

On top of that, the pots look fantastic. We haven't unloaded but I have peeked in and we have the best reduction we have gotten out of this kiln. We have wonderful color, yellows, oranges, greens and very little gray. It is rewarding to see that we can change the way we fire without losing the surface that we want.

We have also just finished gathering information to compare a gas bisque to and electric bisque for our carbon footpring calculator. Mike has the information and he will make the necessary calculations over the week end. Hopefully I can post more on the carbon footprint calculator early next week.

I will let you know all about the unloading. Wish us luck!
Nancy