“Bubble Boy” Wood Kiln Firing

We fired the kiln again over Labor Day weekend, with some pretty nice results.

You might be wondering about the name? Well, after many hours of contemplation on what exactly to name this new little kiln, I settled on “Bubble Boy”. The thing is, I never used to name any of the kilns I built, and then I moved to California, where it seems the clay people insist on naming their kilns. Maybe this has something to do with the maritime tradition of naming ships? In any case the Bubble Boy name seems a bit silly at first, but I think it fits. Aside from the obvious bubble shape of the kiln, the small size of it might suggest that it’s immature, not yet a full grown, but full of energy and ready to go at all times.

Not bad for 16 hours of stoking.

This particular kiln design is inspired by the a few different traditional wood kiln designs, mainly Anagama (buried, climbing), Ogama (wide, dome shape)and Ground Hog (also wide & buried). Another aspect of this kiln is the versatility of it to be a hybrid, and be partially fired with propane (more on this to come!).

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Unloading the New Kiln, Future Firings

The first firing of this little wood kiln went pretty well. There were a few good pots, a lot of mediocre pieces and some interesting things to look at. Sure, I can say I wasn’t expecting any super-fantastic results, but honestly, unloading this firing was a “learning” experience in many ways. I wasn’t totally sure what to expect, as I’ve never done a Cone 5 firing in a wood kiln (intentionally anyway…). There aren’t a lot of other clay artists doing Cone 5 wood firing, especially in this type of wood kiln, so I really wanted to investigate it.

There were at least 6 different clay bodies in the kiln that I thought would be interesting in a Cone 5 wood firing. I mixed up various batches of the local “Brickyard Red” clay, my backyard clay and some other California clays including mostly Newman Red, Muddox, and Lincoln Fire clay. The front of the kiln got up to cone 5 and the back (chimney) got up to about cone 1 or 2. I’m really happy about performance of the kiln, especially considering it was the first firing and excess moisture from the masonry can really hinder the temperature from rising. The whole firing took about 18 hours.

Figure 1: Here is the kiln “unbricked,” after the firing.

Figure 2: Booty from the first firing

The majority of pieces fired in the kiln were flower pots, planters and other “peasant-wares” that I was willing to sacrifice for the sake of an experimental firing. I had a few new things I’ve been working on as well, including some bonsai trays and wall pieces. The pots that turned out well are now available to purchase for reasonable prices at Mad River Gardens in Arcata.

Figure 3: All these pieces were stacked in the chimney.

I was able to stack quite a few pieces in the chimney of this kiln, as I’ve done with many other kilns. The area inside the chimney is not typically used as a stacking space in most kilns but I’ve been able to refine this technique through years of designing, building and firing kilns. I’m usually pretty happy with the results as I don’t expect a whole lot from it, but it can significantly enlarge the kiln while making the overall firing a lot more efficient.

The next firing will be an old fashioned, rip-roaring, full blast Cone 12+, blanketing the pieces in flashy surfaces and natural wood-ash glazes. My clay work hasn’t focused much on this for a few years, so it’s time to revisit it. Hopefully, the results of the next firing will be good, because I’m planning a public kiln-opening that coincides with the North Coast Open Studios on June 4 and 5th. The kiln will be opened and unloaded at 10 a.m. on June 4th.

Below is an example of what is possible at higher temperatures. The surface of this piece has been painted by the fire and is a result of the natural wood ash glaze that happened during the firing. Hopefully, the next firing will have similar results.

Figure 4: Vase circa 2005 w/ native clay slip & natural wood ash glaze. Side-fired on sea shells.

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New Kiln Finished & Fired

I finished the little kiln a few weeks ago, loaded it and finally fired it off, on Mother’s Day. So, accordingly, this first firing is dedicated to mothers. Not just my mom, but moms everywhere – including but not limited to “Mother Earth”. So take a minute to honor thy mother, and think – where would we all be without our moms? I can’t even fathom the number of poorly crafted & ghastly creations I’ve made but my mom said she liked them anyways.

Alrighty then, getting back to the point…. The first firing was mid-range; to about cone 5. Although this is a bit cooler than a typical wood firing, the local clay we’ve been using looks really good at this range and is a nice “brick” red & it saves a lot of BTU’s so it’s a win win situation.

Here is the kiln loaded & bricked up, with a propane burner on to pre-heat. The fiber chimney extension is removable to allow work to be loaded in from the top of the chimney in order to increase the stacking space.

For such a little kiln, it really seemed to swallow up a lot of work!

Here’s the kiln being fired off, sometime around midnight.

The kiln really fired like a gem & seemed to be quite efficient, so it should be pretty eco-groovy compared to some other wood kilns I’ve fired. During the “drying out” stage the kiln steamed for several hours, seeming to hold the temperature down a bit (it even continued to steam after the firing was done!). This first firing lasted about 18 hrs. , burning about a ½ cord of wood & a bit of propane. I can’t wait to unload it…..

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