[Clayart] let er rip``

Robert Harris robertgharris at gmail.com
Tue Sep 7 01:30:04 UTC 2021

One thing I would mention about electric kilns. The pots are mostly heated
by radiation. In a gas kiln the pots are mostly heated by convection. For
the most part this matters not one jot, it does however mean that an
electric kiln doesn't really care how you stack it. (Bisque firings, where
oxygen flow is important, is a slightly different matter, although it's not
nearly as sensitive as flame flow.).

On Mon, 6 Sept 2021 at 18:25, mel jacobson <melpots at mail.com> wrote:

> every fuel kiln built has its own
> time and function for firing.  no two are
> alike.
> lots to consider.  wind direction, height of stack and tightness of stack,
> diam of stack, kiln shelf arrangement, exact size of the
> flue. and it goes without saying the amount of pressure
> you have at orifice. it all matters.
> the roof system is critical...from flat to tall arch.
> SO, it is never a race.  you must find the sweet system
> when it all works in harmony.  Many kilns do not run
> well with an east wind.  maybe hocus pocus, many friends
> have felt that way.  A big wall near the kiln and and east
> wind shuts down a good friends kiln. He will not fire his kiln
> with those conditions.  That too is a thought, wait for perfect
> conditions may be very smart.  waiting is often prudent.
> leaving gaps and space for the fire to pass through the pots
> may be a great money saver.  save those last 10 pots for
> another time. over stacking is a false economy.
> the wish i have for potters is to find out how your kiln
> fires best.  try different timing and systems.  chart it.
> use the pyrometer to find better ways...heat rise, heat fall.
> Much of what i just chatted about fits for electric kilns too.
> never assume that electric firing is automatic.
> mel
> website: www.melpots.com
> www.melpots.com/CLAYART.HTML
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