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Firing Log

ancient kiln | 21st century logbook

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March 31, 2006

Firing Update, #3

Filed under: anagama, 6th,Firing — odin @ 7:19 am

A quick note before I crash, and I’m crashing hard.

It was a hard night last night. Maybe I’m pushing the kiln but it usually seems hotter by this time. Some data points: it’s the warmest I’ve ever fired and there has been very little wind. Usually it is colder than Antarctica during firings. Not this time — I’m a actually sweating with only a t-shirt and shirt. Also missing is the steady 25 mph wind w/ 50 mph gusts.

Interestingly, the wind picked up after dawn and the temperatue shot up. I’ll have to consider that — is the wind making a stronger draft, or is it slowing the draft down? I’ll have to think back but realisticly, after I wake up. I need to sleep right now.

Oh, another concerned citizen stopped by to warn me of a chimney fire. I’ve learned to make certain that the 911 call center is well advised of my firings. A call and fax prior and a call every evening as well. No firetrucks or cops yet so it seems to be working.

Bed …. now.

March 30, 2006

Firing Update, #2

Filed under: anagama, 6th,Firing — odin @ 10:41 am

Wood” (in quotes because I actually start w/ charcoal briquettes — insert while burner is running a couple at a time) started going into the kiln on March 29 at 5:50 am. Right now, March 30, 2006 at 10:15 am, the kiln is hovering around 40-41 mV and has been since the middle of last night — giving off some color as well:

First flame from 6th anagama firing

The ground is mostly done steaming and burning. That new dirt I spread? Well, I’ve spent the last day smelling all the organic components burn off. Even earlier this morning the ground was steaming strongly but I think it’s about dried out now. When it dries out enough, the kiln temperature should rise again. Pushing it doesn’t make it happen faster, but it will tire you out. The kiln get to the temperature it wants to be at, whenever it wants to get there. Here’s a steam shot taken before the wood burning really got underway:

anagama steams during heat up -- cats love it

I think the ground is pretty well dried because the “stripe” effect is gone. The ground right above the center-line of the kiln dries first. Then, the ground to the outside of the point above the kiln’s foundation dries. Finally, the area directly above the foundation also dries out. Deep water moves up through that region and keeps it moist. When that area dries out, the deep water is also dried.

Here’s a shot of the stripe effect:

anagama pushing up groundwater during preheat

I’m going to bed now, 10:47 am.

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