Snail Scott on wed 22 dec 10
On Dec 22, 2010, at 12:07 PM, Claudia MacPhee wrote:
> ...does the ash make any difference in the reading of the cones? I =3D
have a very 'ashy' kiln and the cone packs are always really glazed. =3D
Wondered if that made them less accurate? Or was it really that hot that =
=3D
turned them into a puddle??
Any flux on the surface of cones will tend to=3D20
make them bend at lower temperatures than=3D20
they would otherwise.=3D20
Less accurate? That's a different question=3D20
entirely.
Cones are supposed to respond to actual kiln=3D20
conditions. That's why we use them, after all.=3D20
Your art is being affected by the kiln environment=3D20
just as the cones are. Cones are skinny things,=3D20
though, and closer to vitrification than your clay, =3D20
so they (I would guess) are going to be more=3D20
affected by the ash than thicker clay which s=3D20
not already on the verge of melting. So it won't=3D20
be as exact a correspondence as you would=3D20
get in a neutral-environment firing. Still, it=3D20
really doesn't matter whether your firing is=3D20
actually ^8, or ^12, or whatever. The cones=3D20
should still respond to similar firings in similar=3D20
ways, and as long as you know what cone=3D20
conditions signal your desired firing outcome,=3D20
it doesn't matter one whit whether it corresponds=3D20
to someone else's firing at the same nominal=3D20
cone.
Just because someone else's dog is also called=3D20
'Rover' doesn't mean yours ought to be a cocker=3D20
spaniel also. They both answer to the same name,=3D20
but the fact that they aren't interchangeable is of=3D20
no relevance to anyone. And your ^10 is yours,=3D20
whether or not anyone else's ^10 bears any=3D20
resemblance to it at all.
-Snail=3D
Claudia MacPhee on wed 22 dec 10
A Question....does the ash make any difference in the reading of the cones?=
=3D
I have a very 'ashy' kiln and the cone packs are always really glazed. Won=
=3D
dered if that made them less accurate? Or was it really that hot that turne=
=3D
d them into a puddle???
Claudia MacPhee Tagish=3D2C Yukon
Getting ready to head out into the snowbank to make some more knick-knacks=
=3D
=3D20
=3D
Paul Herman on wed 22 dec 10
Hi Claudia,
As far as I know, cones read accurately in both wood and salt firings.
Orton has stated that they are accurate in salt, and from my
observations of the way glazes melt in the wood kiln and gas kiln
respectively, they are very close if not the same.
Been firing? I hope they are coming out well.
Paul Herman
Great Basin Pottery
Doyle, California US
www.greatbasinpottery.com/
On Dec 22, 2010, at 10:07 AM, Claudia MacPhee wrote:
> A Question....does the ash make any difference in the reading of the
> cones? I have a very 'ashy' kiln and the cone packs are always
> really glazed. Wondered if that made them less accurate? Or was it
> really that hot that turned them into a puddle???
>
> Claudia MacPhee Tagish, Yukon
>
> Getting ready to head out into the snowbank to make some more knick-
> knacks
Lee Love on wed 22 dec 10
On Wed, Dec 22, 2010 at 12:07 PM, Claudia MacPhee
wrote:
> A Question....does the ash make any difference in the reading of the cone=
=3D
s? I have a very
> 'ashy' kiln and the cone packs are always really glazed. Wondered if that=
=3D
made them less >accurate? Or was it really that hot that turned them into =
=3D
a puddle???
You might not get the same body maturity, but the cones get the same
ash and vapor as the pots in the kiln, so the surfaces are effected
equally.
Hope you make some pots too. ;^) Big tourist thing here are wild rice ja=
=3D
rs.
--
=3DA0Lee, a Mashiko potter in Minneapolis
http://mingeisota.blogspot.com/
=3D93Observe the wonders as they occur around you. Don't claim them. Feel
the artistry moving through and be silent.=3D94 --Rumi
Hank Murrow on wed 22 dec 10
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Content-Type: text/plain;
charset=3Dus-ascii
On Dec 22, 2010, at 10:07 AM, Claudia MacPhee wrote:
> A Question....does the ash make any difference in the reading of the =3D
cones? I have a very 'ashy' kiln and the cone packs are always really =3D
glazed. Wondered if that made them less accurate? Or was it really that =3D
hot that turned them into a puddle???
>=3D20
> Claudia MacPhee Tagish, Yukon
In my experience with anagrams, no. I believe that the ash, being mostly =
=3D
calcium, will lower the effective melting point of any high temp cone. =3D
In the kilns I fire in, I think it is a one and a half to two cone =3D
difference. It takes getting C14 bending or down to get the results I =3D
like on the wares.
Cheers, Hank in Eugene, still dreaming of Crete
--Apple-Mail-68--936057983
Content-Transfer-Encoding: 7bit
Content-Type: text/plain;
charset=3Dus-ascii
Some wares from the Jewel Creek anagama firing from last June.........
--Apple-Mail-68--936057983--
Eric Hansen on thu 23 dec 10
Snail: That depends - the pieces that get the fly ash will have
surfaces at the same pyrometric cone equivalent as what the cones
reflect, but the body, depending on how thick it may be will not. And
there mean be remarkable differences between results front and back in
the kiln, again, dependent on fly ash and atmosphere, which also may
vary from pot to pot as well. It is also saying that cone 10 clays
make suitable clay body for wood kilns where a much higher cone bends.
Also glazed pieces may reach different maturities than unglazed ones
if the glaze is insulating the pot from being invaded by the calcium
atmosphere and deposits.
- h -
On Wed, Dec 22, 2010 at 10:14 PM, Snail Scott w=
=3D
rote:
> On Dec 22, 2010, at 12:07 PM, Claudia MacPhee wrote:
>> ...does the ash make any difference in the reading of the cones? I have =
=3D
a very 'ashy' kiln and the cone packs are always really glazed. Wondered if=
=3D
that made them less accurate? Or was it really that hot that turned them i=
=3D
nto a puddle??
>
>
> Any flux on the surface of cones will tend to
> make them bend at lower temperatures than
> they would otherwise.
>
> Less accurate? That's a different question
> entirely.
>
> Cones are supposed to respond to actual kiln
> conditions. That's why we use them, after all.
> Your art is being affected by the kiln environment
> just as the cones are. Cones are skinny things,
> though, and closer to vitrification than your clay,
> so they (I would guess) are going to be more
> affected by the ash than thicker clay which s
> not already on the verge of melting. So it won't
> be as exact a correspondence as you would
> get in a neutral-environment firing. =3DA0Still, it
> really doesn't matter whether your firing is
> actually ^8, or ^12, or whatever. The cones
> should still respond to similar firings in similar
> ways, and as long as you know what cone
> conditions signal your desired firing outcome,
> it doesn't matter one whit whether it corresponds
> to someone else's firing at the same nominal
> cone.
>
> Just because someone else's dog is also called
> 'Rover' doesn't mean yours ought to be a cocker
> spaniel also. They both answer to the same name,
> but the fact that they aren't interchangeable is of
> no relevance to anyone. And your ^10 is yours,
> whether or not anyone else's ^10 bears any
> resemblance to it at all.
>
> =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =
=3DA0 =3DA0 =3DA0 =3DA0 =3DA0 -Snai=3D
l
--=3D20
Eric Alan Hansen
Stonehouse Studio Pottery
Alexandria, Virginia
americanpotter.blogspot.com
thesuddenschool.blogspot.com
hansencookbook.blogspot.com
"Simplify, simplify, simplify" - Thoreau
Eric Hansen on thu 23 dec 10
Hank - Oh that explains a lot - one common gripe is the wood kilns
underfire, maybe that is because the cones are reading wonky -
- hansen -
On Wed, Dec 22, 2010 at 3:53 PM, Hank Murrow wrote:
>
> On Dec 22, 2010, at 10:07 AM, Claudia MacPhee wrote:
>
>> A Question....does the ash make any difference in the reading of the con=
=3D
es? I have a very 'ashy' kiln and the cone packs are always really glazed. =
=3D
Wondered if that made them less accurate? Or was it really that hot that tu=
=3D
rned them into a puddle???
>>
>> Claudia MacPhee Tagish, Yukon
>
> In my experience with anagrams, no. I believe that the ash, being mostly =
=3D
calcium, will lower the effective melting point of any high temp cone. In t=
=3D
he kilns I fire in, I think it is a one and a half to two cone difference. =
=3D
It takes getting C14 bending or down to get the results I like on the wares=
=3D
.
>
> Cheers, Hank in Eugene, still dreaming of Crete
>
>
>
> Some wares from the Jewel Creek anagama firing from last June.........
>
--=3D20
Eric Alan Hansen
Stonehouse Studio Pottery
Alexandria, Virginia
americanpotter.blogspot.com
thesuddenschool.blogspot.com
hansencookbook.blogspot.com
"Simplify, simplify, simplify" - Thoreau
David Woof on thu 23 dec 10
Hi Claudia=3D2C
=3D20
What I do is shelter the cones in the lee side of a pot or for heavy ash ar=
=3D
eas I throw small closed forms and cut out enough of one side to form a "co=
=3D
ne hut" to protect the cones if I'm using a glaze that needs a critical tem=
=3D
p. Helps in salt firings as well. For general production I fire glazes =
=3D
that work over a 3 cone range and place pots where the fire will effect the=
=3D
m in the way I wish. Also you can place silent witness cones in a small th=
=3D
in walled sagger pot to compare the cone differences between the ash fluxed=
=3D
cones and the protected ones for when you unload the kiln. .
=3D20
As Hank noted=3D2C you get to know your kiln and what that fluxing cones di=
ff=3D
erence is for you.
=3D20
Misneach and many good firings........
=3D20
David Woof.....dreaming of all night Fado in Lisbon while listening to the =
=3D
Rio Verde hurling boulders around as she/he rises. With this rain I may s=
=3D
ee cows roiling by in AM light. In the last flood I saw 150 year old cotto=
=3D
nwoods dancing upright down the river=3D3B their huge root systems with ent=
wi=3D
ned rocks and boulders acting as ballast. The smaller cottonwoods meekly su=
=3D
rrendered=3D2C bent with the rush and are getting themselves upright again.=
=3D
Life prevails. The natural order will have it's way. What are we to mock=
=3D
or resist?
=3D20
=3D20
Re: Cones in Wood Kilns
Posted by: "Hank Murrow" hmurrow@EFN.ORG=3D20
Date: Wed Dec 22=3D2C 2010 5:00 pm ((PST))
=3D20
=3D20
On Dec 22=3D2C 2010=3D2C at 10:07 AM=3D2C Claudia MacPhee wrote:
=3D20
> A Question....does the ash make any difference in the reading of the cone=
=3D
s? I have a very 'ashy' kiln and the cone packs are always really glazed. W=
=3D
ondered if that made them less accurate? Or was it really that hot that tur=
=3D
ned them into a puddle???
>=3D20
> Claudia MacPhee Tagish=3D2C Yukon
=3D20
In my experience with anagrams=3D2C no. I believe that the ash=3D2C being m=
ostl=3D
y calcium=3D2C will lower the effective melting point of any high temp cone=
. =3D
In the kilns I fire in=3D2C I think it is a one and a half to two cone diff=
er=3D
ence. It takes getting C14 bending or down to get the results I like on the=
=3D
wares.
=3D20
Cheers=3D2C Hank in Eugene=3D2C still dreaming of Crete
=3D20
=3D20
=3D20
=3D
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