Talbott on fri 18 apr 97
Can anyone tell me the differences (firing times, affect on glazes, etc...)
in fueling a wood fired kiln (NOT hybrid gas and wood) with seasoned
hardwoods vs scrap pine and other soft woods???.. Obviously the BTU
content of hardwoods is far greater... Just curious what the experts have
to say on this subject....
Also does anyone know what type of wood ash Karen Karens uses in her ash
glazes?....
1ST ANNUAL CLAYARTERS' GALLERY - NAPLES, MAINE (Summmer 1997)
http://fmc.utm.edu/~dmcbeth/cag/naples.htm
Celia & Marshall Talbott, Pottery By Celia, Route 114, P O Box 4116,
Naples, Maine 04055-4116,(207)693-6100 voice and fax,(call first)
WBS Live Chat Room, Sat Nites 10 PM EST, Private Room: Clayarters
Sheila Clennell on sat 19 apr 97
>----------------------------Original message----------------------------
>Can anyone tell me the differences (firing times, affect on glazes, etc...)
>in fueling a wood fired kiln (NOT hybrid gas and wood) with seasoned
>hardwoods vs scrap pine and other soft woods???.. Obviously the BTU
>content of hardwoods is far greater... Just curious what the experts have
>to say on this subject....
>
Dear Marshall and Celia: You've asked a HUGE question for a e-mail reply!!
For those of us that have been around woodkilns for awhile its like asking
"How do you make pottery?" Firing time and glaze effects will depend on
design of kiln,stoking,placement in kiln, weather, condition of wood,types
of glazes, clay body, kiln construction etc etc. For a good read and lots
of great photos I would recommend Wood-Fired Stoneware and Porcelain by
Jack Troy.
I use mostly cedar and get a yellow ash on the pots, if it gets heavier it
runs in green drips. Your question has a lifetime of work involved. Start
with Jacks book, build a kiln and start firing. It will answer your
questions much more thoroughly than e-mail, its just alot more work.
Long may your chimney smoke!
Tony
Sheila and Tony Clennell
Gleason Brook Pottery
Box l0, RR#2,
Wiarton, Ontario
NOH 2TO
Canada
Phone # 1 (519) 534-2935
Fax # 1 (519) 534-0602
E-mail clennell@bmts.com
Charles Mcgee (ART) on sat 19 apr 97
After the BTU's consider the burn rate. For example oak is a longer
burning wood than pine. The energy obtained from the wood is split
between the combustion of the resin in the wood and the air passing over
the hot embers. I believe that it is 40% the former and 60% the later.
As far as the effect on the glazes I suggest finding the chemical
breakdown of the wood you are using as to see what oxides it is high in.
There is a general break down in Phil Rogers 'Ash Glaze' book that will
get you on the the right track.
Chump
David Hendley on sun 20 apr 97
At 06:50 AM 4/18/97 EDT, you wrote:
>----------------------------Original message----------------------------
>Can anyone tell me the differences (firing times, affect on glazes, etc...)
>in fueling a wood fired kiln (NOT hybrid gas and wood) with seasoned
>hardwoods vs scrap pine and other soft woods???.. Obviously the BTU
>content of hardwoods is far greater... Just curious what the experts have
>to say on this subject....
>
I've found that there's not much difference between using hardwoods
and softwoods, provided both are DRY. Seasoning and size are more important
than wood type. I try to avoid pine because of the nasty sooty smoke the
pitch puts out, and I have to help break up the burned pieces to make the
coals go ahead and fall through the grate, but it still works OK. Can't
really tell any difference in the flashing effects on the finished pots.
My kiln is a modified (larger) Olsen Fast Fire design.
David Hendley
Maydelle, Texas
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