Firing Joy’s Kiln

joy_kiln1

Our friend Joy Brown was loading her big anagama kiln the other day and I went by to see where my clay “balls” were going to be in the kiln and just watch the action.

Joy makes large ceramic sculpture of what seem to be large, round women sitting or kneeling. They’re wonderful and she’s got “clients” who have them the world over. Getting them in this long tube of a kiln is no easy job.

joy_richard_mud

During my 12 hour shift firing the kiln Joy and I “mudded up” the door with wet clay and straw and rebuilt the firebox to let in a bit less air. Messy job but nice to get messy again after over 20 years of being mostly digital with little clay mess.

 

 

 

pyrometer

In the old days we used only pyrometric “cones” to measure temperature inside a kiln and they’re still used in many places. Cones are small ceramic objects that look like 3″ long, tall, thin pyramid that one sticks in a wad of clay and then places near a porthole so one can see it melt and know the kiln has reached a certain temperature. Now, in the modern (digital) age, digital pyrometers are used. The older one on the left here isn’t used anymore. The newer one (yellow) has two inputs from two probes: one for the front (the larger, higher number here) and one for the back of the kiln. This instrument is so accurate and the big kiln so responsive that you can affect change just by putting in the smallest piece of wood.

kiln_fire_ports

I went back the next day and Joy was struggling to get the back of the kiln caught up with the front and was stoking heavily with little air to create a longer flame and so, heat the back more. The flame was so long it came out the closed portholes looking for air.

The fire is over now. In a few days, I’ll go see the kiln unloaded.

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