[Clayart] The Electric Kiln is King

Robert Harris robertgharris at gmail.com
Mon Oct 25 13:58:56 UTC 2021

Mel, you cannot post this and ALSO post this

"Some early results by changing pyrometers around and using the gun
indicates the digital pyrometer as expected was low at cone 11 by almost
30 degrees"

Which is what I was asking about. The two are contradictory. And according
to Orton Cone 10 is exactly when the tip barely touches the shelf. (It
drives me crazy when people pack their cobes so close together they fall
into each other.)

Of course you're absolutely right that it doesn't matter what you do if you
can do it consistently, but there IS a definition of Cone 10. And if you're
not firing to Orton's specification you can't make a judgment on the
accuracy of your pyrometer.

Interesting fact for the morning. Josiah Wedgwood was elected as Fellow of
thr Royal Society (the most senior academic society in thr UK) because of
his invention of various pyrometric devices. Basically cone precursors. You
can be damn sure that firing absolutely accurately every time is essential
in industry.


On Mon, Oct 25, 2021, 06:03 mel jacobson <melpots at mail.com> wrote:

> It is becoming obvious that electric firing is now the standard.
> Few are rushing to build wood kilns, or other fuel kilns.
> I assume that 70 percent of clayarters are firing electric kilns.
> But, saying that It does remind folks that taking charge of that
> kiln, understanding time and temp based on your work, is critical to
> making new and exciting work that belongs to you.
> For sure there are road blocks in the programs that do not allow
> you to fire faster, but they can be changed.
> The big issue about understanding cones is that you have many options
> about firing your kiln.  That is why I tell folks to fire one cone higher
> and see what happens. Understand the range of your glazes.  for
> example"""""
> Last week here at the farm I got all pissed at a 1234 glaze that had a
> dead look. No spark.  I got out the Chrome and put in a heaping 1/4 cup
> of chrome in the bucket.  Wow, what a great glaze. There will be fist
> fights
> at my holiday sale for those pots.
> Now, doing that makes me an enemy to those that measure with a digital
> gram scale..."Can you repeat it????".   "who cares, I will just make a
> new one." I gave up Rhodes 32 years ago. It was worn out. I love firing
> my mel6 in the electric kiln.  all new. But, I fire to cone 7. Bright
> yellow,
> what a great glaze.  My intuition was dead on with that green glaze. A
> heaping
> 1/4 cup measure can be repeated. period.
> mel
> website: www.melpots.com
> www.melpots.com/CLAYART.HTML
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