mel jacobson on sat 29 sep 01
i would go so far as to say:
`every day you fire is different.`
you cannot just light it and follow a script.
if you have blowers, power, 10 pounds of gas pressure
you are almost home free. a kiln that has provided
the weather for you.
but, with natural air, venturi burners....each day is different.
10 mile an hour wind, 30 mile an hour wind...is it different?
high pressure, low pressure... is it different?
-43 F, 85F is it different?
snow, rain, clear...no wind...is it different?
learning to fire a kiln makes for many sets of differences.
learn about them, and learn your kiln.
the oxyprobe has taught me many things...but, the most important is
that the smallest changes is gas pressure or flue opening can change
what is happening in a kiln a great deal.
seat of the pants firing...nice idea, but not always the best way.
firing by previous notes, nice idea, but not always the best way.
using your ears, eyes, nose....and experience...good way to fire.
mel
From:
The Farm, in Wisconsin
web site: http://www.pclink.com/melpots
Les Crimp on sat 29 sep 01
Interesting! Here on the Wet Coast in the Great Northwest Rainforest, when
we raku fire, we feel we get the best results ( colour, etc.) when it is
raining in the winter months.
Les Crimp on that Island in the Pacific.
lcrimp@home.com
iandol on sun 30 sep 01
Dear Les,
Wet weather introduces a lot of water vapour into the atmosphere. Not =
sure if this changes the density but it could induce the Water Gas =
reaction if the fire temperature gets above 1000 deg Celsius. The =
Hydrogen and Carbon monoxide which are created by that process would =
help with local reduction.
The idea of firing on very cold clear nights is an interesting one. =
Density of the air will be greater so there may be a nocturnal increase =
in barometric pressure which would increase draught speed.
All the best,
Ivor Lewis.
Celia Littlecreek on mon 1 oct 01
There are some good things to say about midnight Raku. (firing in the dark).
My work is better if I have no flames coming out the top of the kiln. I can
make adjustments for this after dark because I can see the flames better and
make adjustments to bring the kiln back into oxidation. I only like
post-fire reduction. I prefer not to have reduction in the kiln.
-- Original Message -----
From: "Richard Jeffery"
To:
Sent: Monday, October 01, 2001 2:34 PM
Subject: Re: firing and weather
> personally, I find I get much better results raku firing after dark in the
> winter.
>
> got more to do with the neighbours not seeing the smoke than any perceived
> changes in reduction, though....
>
>
> Richard
> Bournemouth UK
> www.TheEleventhHour.co.uk
>
>
> -----Original Message-----
> From: Ceramic Arts Discussion List [mailto:CLAYART@LSV.CERAMICS.ORG]On
> Behalf Of iandol
> Sent: 29 September 2001 20:04
> To: CLAYART@LSV.CERAMICS.ORG
> Subject: firing and weather
>
>
> Dear Les,
>
> Wet weather introduces a lot of water vapour into the atmosphere. Not sure
> if this changes the density but it could induce the Water Gas reaction if
> the fire temperature gets above 1000 deg Celsius. The Hydrogen and Carbon
> monoxide which are created by that process would help with local
reduction.
>
> The idea of firing on very cold clear nights is an interesting one.
Density
> of the air will be greater so there may be a nocturnal increase in
> barometric pressure which would increase draught speed.
>
> All the best,
>
> Ivor Lewis.
>
>
____________________________________________________________________________
> __
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
> melpots@pclink.com.
>
>
____________________________________________________________________________
__
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
>
Richard Jeffery on mon 1 oct 01
personally, I find I get much better results raku firing after dark in the
winter.
got more to do with the neighbours not seeing the smoke than any perceived
changes in reduction, though....
Richard
Bournemouth UK
www.TheEleventhHour.co.uk
-----Original Message-----
From: Ceramic Arts Discussion List [mailto:CLAYART@LSV.CERAMICS.ORG]On
Behalf Of iandol
Sent: 29 September 2001 20:04
To: CLAYART@LSV.CERAMICS.ORG
Subject: firing and weather
Dear Les,
Wet weather introduces a lot of water vapour into the atmosphere. Not sure
if this changes the density but it could induce the Water Gas reaction if
the fire temperature gets above 1000 deg Celsius. The Hydrogen and Carbon
monoxide which are created by that process would help with local reduction.
The idea of firing on very cold clear nights is an interesting one. Density
of the air will be greater so there may be a nocturnal increase in
barometric pressure which would increase draught speed.
All the best,
Ivor Lewis.
____________________________________________________________________________
__
Send postings to clayart@lsv.ceramics.org
You may look at the archives for the list or change your subscription
settings from http://www.ceramics.org/clayart/
Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
Carole Fox on wed 3 oct 01
Celia Littlecreek wrote, (regarding raku firing):
. I only like post-fire reduction. I prefer not to have reduction =
in the kiln.
Celia,
Can you explain the difference in your work regarding the oxidation and =
reduction firings?
Thanks.
Carole Fox
Silver Fox Pottery
Elkton, MD - anxious to try out some new clay today!!!
cfox@dca.net
Celia Littlecreek on thu 4 oct 01
I have attended lots of workshops and seminars given by lots of ceramists
that do Raku, so I have lots of hints and have learned many techniques. I
try to remember that anyone can have a good idea, so I keep an open mind. I
have a book I call my Raku Bible. It is the book by Steve Bramfman. He
mentions in it, the difference between kiln reduction and post fire
reduction. I fire in a fibre kiln with propane in an oxygen atmosphere. I
try to never have a flame coming from the top of the kiln. All my color in
the coppers and lusters come from post-fire reduction, and to be sure my
glazes flux, I fire by sight, pyrometer and by putting a wet glaze piece in
every load. When the wet glazed piece fluxes, then I know the other pieces
in the kiln are just right too.
Hope I have added something helpful.
----- Original Message -----
From: "Carole Fox"
To:
Sent: Wednesday, October 03, 2001 8:25 AM
Subject: Re: firing and weather
Celia Littlecreek wrote, (regarding raku firing):
. I only like post-fire reduction. I prefer not to have reduction in
the kiln.
Celia,
Can you explain the difference in your work regarding the oxidation and
reduction firings?
Thanks.
Carole Fox
Silver Fox Pottery
Elkton, MD - anxious to try out some new clay today!!!
cfox@dca.net
____________________________________________________________________________
__
Send postings to clayart@lsv.ceramics.org
You may look at the archives for the list or change your subscription
settings from http://www.ceramics.org/clayart/
Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
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