[Clayart] Bourry Box
vpitelka at dtccom.net
Wed Jan 4 18:29:45 EST 2017
Hi Lee -
For my first seventeen years at the Craft Center we had a two-chamber Bourry-Box built by Jane Dillon and her students in 1987 under the guidance of Doug Casebeer. Doug is a fine potter and an acknowledged woodfiring expert, but this kiln was built with the fireboxes too small, and that was always a struggle for us. If you want to see that kiln, it was a cover story in Ceramics Monthly in 1988. We tore it down five years ago and Bryce Brisco used the bricks to build a nice 40 cubic foot crossdraft I mentioned in a previous post this evening.
I am not a fan of the Bourry-box. When you read Steve Harrison's "Laid-Back Wood Firing" or you listen to Linda Christianson talk about sitting back with a mint julep and stoking her Bourry-box every fifteen minutes, they sound pretty wonderful, but it is all about the results. My favorite small wood kiln design is the Peg-Udall/Ruggles-and-Rankin crossdraft design. I think they give you a lot more flexibility in results than a Bourry-box. Because of the upside-down design of the Bourry-box the flames and ash are pulled all the way down to the throat-arch and then back up along the bagwall into the ware chamber (unless you are building a train kiln with a Bourry-box), and it takes some careful management if you want distinctly woodfired effects. Such results are far easier to achieve in the Ruggles-and-Rankin crossdraft.
If you do decide to stick with the Bourry-box, go oversize on the firebox.
Appalachian Center for Craft
Tennessee Tech University
vpitelka at dtccom.net
From: Clayart [mailto:clayart-bounces at lists.clayartworld.com] On Behalf Of Lee Taylor
Sent: Wednesday, January 4, 2017 3:03 PM
To: clayart at lists.clayartworld.com
Subject: [Clayart] Bourry Box
Dear Clayart list:
I am helping my daughter with the design and construction of her first kiln. I have built several wood kilns, but never a Bourry box. The kiln chamber is pretty small and the size of the fireboxes that I see in plans and photos all seem like they are really oversized for the size of her kiln.
Is there a functional ideal for the size of a Bourry firebox? Is it proportional to the size of the chamber? Or does it just not work if it is too small?
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