Firing With Wood

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<div> </div> </td> </tr><tr> <td valign="top" height=395 BGCOLOR="#FFFFFF" TEXT="#080000"> <div> <I><B>Firing With Wood</b></I></div> <bR> <bR> <bR> <DIV ALIGN="LEFT"></DIV> <div> This is the wood firing kiln at Brushy Creek Pottery.</div> <div> It is a 50 cubic foot, sprung arch, fast firing, wood kiln, </div> <div> It was built by Ken George and includes over 3,000 firing bricks.</div> <bR> <div> <IMG SRC="2b001050.jpg" border=0 width="257" height="261" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> Front</div> <bR> <div> <IMG SRC="2bc5e070.jpg" border=0 width="350" height="263" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> Loaded with glazed pottery</div> <div> There are approximately 150 pieces in this kiln load</div> <bR> <div> <IMG SRC="1c4aa480.jpg" border=0 width="170" height="72" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> A pyrometrical cone pac is placed in a spot </div> <div> that will be visible from a spy hole left open in the kiln door.</div> <bR> <div> The cones are used to measure inside kiln temperatures. </div> <div> These cones will become soft and melt at individual temperature ranges during the firing.  Cone pacs are placed strategically throughout the kiln, this allows the potter to see how hot the kiln is in various places.  It is important to maintain good even temperatures though out the kiln during firing to obtain maximum performance.</div> <div> A pyrometer is also used by some potters as a means of measuring temperatures.</div> <bR> <div> <IMG SRC="2c82c100.jpg" border=0 width="300" height="272" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> The door is bricked up and the kiln is ready to light</div> <div> The spy hole brick is in the middle of the kiln door.</div> <bR> <div> <IMG SRC="2bd5e070.jpg" border=0 width="350" height="263" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> Getting the fire started</div> <bR> <div> The object is to make a nice hot bed of coals that </div> <div> will spread evenly across the bottom of the kiln</div> <div> This is a slow process and usually takes approximately 4 hours.</div> <bR> <div> Constant attention to stoking or feeding the fire is essential </div> <div> during the entire firing process.  Improper stoking can cause your </div> <div> internal temperature to fluctuate and not rise at the proper rate .</div> <bR> <div> Proper stoking acts in the same manner as a control on your oven,</div> <div> Adding wood in just the right amounts at just the right time,</div> <div> allows the potter the ability to raise the internal</div> <div>  kiln temperature over time.</div> <bR> <div> <IMG SRC="2b85e070.jpg" border=0 width="350" height="263" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> The fire is spreading across the kiln</div> <bR> <bR> <div> <IMG SRC="2baf4770.jpg" border=0 width="500" height="375" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> The other stoking side of the kiln far right window</div> <div> Notice the smoke coming from the top of the chimney</div> <div> Approximately 3 hours into the firing</div> <bR> <div> <IMG SRC="2be77190.jpg" border=0 width="375" height="281" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> The orange glow from the right side firing box,</div> <div>  indicates the fire has spread across the bottom of the kiln </div> <bR> <div> A nice bed of coals is apparent by the red glow in the kiln chamber</div> <bR> <div> <IMG SRC="2c65e070.jpg" border=0 width="350" height="263" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> At 4 hours Ken and his crew are gradually feeding the fire.</div> <bR> <div> Many things are going on inside the kiln at this point:</div> <bR> <div> 1) Temperature Changes are occurring</div> <div> a. stoking one firing chamber then the other </div> <div> b. gradually increasing the amount of wood being added, </div> <div> while slowly raising the temperature.</div> <bR> <div> 2) All of the excess moisture from the pottery and </div> <div> the kiln bricks is evaporating,</div> <div> steam can be seen rising from the kiln</div> <bR> <div> 3) Tempering the kiln, evening the kiln temperature throughout</div> <bR> <div> 4) Creating a hot enough atmosphere that will </div> <div> spontaneously combust the wood</div> <bR> <div> <IMG SRC="2c45e070.jpg" border=0 width="350" height="263" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <bR> <bR> <div> <A HREF="id20.htm" TARGET="_top" TITLE="Throwing "><U>Throwing  </U></A><FONT SIZE="4" COLOR="#660000" FACE="Symbol" >   ·   </FONT><A HREF="id21.htm" TARGET="_top" TITLE="Altering"><U>Altering</U></A><FONT SIZE="4" COLOR="#660000" FACE="Symbol" >   ·   </FONT><A HREF="id22.htm" TARGET="_top" TITLE="Painting with clay slip"><U>Painting with clay slip</U></A><FONT SIZE="4" COLOR="#660000" FACE="Symbol" >   ·   </FONT><A HREF="id25.htm" TARGET="_top" TITLE="Handling"><U>Handling</U></A><FONT SIZE="4" COLOR="#660000" FACE="Symbol" >   ·   </FONT><A HREF="id27.htm" TARGET="_top" TITLE="Burnishing"><U>Burnishing</U></A>  <A 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