Randy O'Brien on thu 4 mar 04
I remember reading an article years ago on how cones were developed based on
changes to the UMF. Does anyone know the name of this article and where it
appeared? I found this info for cones over cone 5 in the Clayart archives.
Anybody know what the numbers are for cones under cone 5?
>Cone 5 - K2O 0.3, CaO 0.7, Al2O3 0.5, SiO2 5
>Cone 6 - K2O 0.3, CaO 0.7, Al2O3 0.6, SiO2 6
>Cone 7 - K2O 0.3, CaO 0.7, Al2O3 0.7, SiO2 7
>Cone 8 - K2O 0.3, CaO 0.7, Al2O3 0.8, SiO2 8
>Cone 9 - K2O 0.3, CaO 0.7, Al2O3 0.9, SiO2 9
>Cone 10 - K2O 0.3, CaO 0.7, Al2O3 1.0, SiO2 10
Thanks,
Randy O'Brien
http://www.dakotacom.net/~rdobrien
John Hesselberth on thu 4 mar 04
Hi Randy,
I don't know if this is the article you are referring to, but the
original article on the development of cones was published by Hermann
Seger. It can be found in "The Collected Writings of Hermann A. Seger",
vol 1, pp 224-249. The title of the article is "Pyrometers and the
Measurement of High Temperatures. Standard Cones"
Regards,
John
On Thursday, March 4, 2004, at 04:31 AM, Randy O'Brien wrote:
> I remember reading an article years ago on how cones were developed
> based on
> changes to the UMF. Does anyone know the name of this article and
> where it
> appeared? I found this info for cones over cone 5 in the Clayart
> archives.
> Anybody know what the numbers are for cones under cone 5?
>
>> Cone 5 - K2O 0.3, CaO 0.7, Al2O3 0.5, SiO2 5
>> Cone 6 - K2O 0.3, CaO 0.7, Al2O3 0.6, SiO2 6
>> Cone 7 - K2O 0.3, CaO 0.7, Al2O3 0.7, SiO2 7
>> Cone 8 - K2O 0.3, CaO 0.7, Al2O3 0.8, SiO2 8
>> Cone 9 - K2O 0.3, CaO 0.7, Al2O3 0.9, SiO2 9
>> Cone 10 - K2O 0.3, CaO 0.7, Al2O3 1.0, SiO2 10
>
> Thanks,
> Randy O'Brien
>
http://www.frogpondpottery.com
http://www.masteringglazes.com
John Britt on thu 4 mar 04
Randy,
Try David Green's "A Handbook of Pottery Glazes" ISBN 0-8230-2181-5, page
29-48.
It is a great way to understand glazes and will also help you to
understand Currie's Systematic Method.
Seger's first cone was cone 4:
Cone 4 = Si - 4 Al -0.5
Cone 3 = Si - 4 Al -0.45 Fe -0.05
Cone 2 = Si - 4 Al -0.4 Fe 0.1 ........
The Ca and K stay at .3 and .7 until cone 010.
Get the book from interlibrary loan! You won't regret it!
Hope it helps,
John Britt
Ivor and Olive Lewis on fri 5 mar 04
Randy,
What is UMF ? Please elaborate, for those people who do no know the
lingo?
Hermann Seger did the spade work circa 1890. His memoirs are
translated and accessible through AcerS.
Cone values were based on a constant Al2O3/SiO2 ratio, in diminishing
proportions to a constant relationship between K2O and CaO.
Things had to be fiddled with lower cone values which incorporate Iron
oxide and other compounds as the scale goes into the 0-numbers.
You may need to read Homer F. Staley to comprehend the relationship
between melting point and cone activity. See Am. Cer. Soc.
Transactions V13, 1911, pp 668-682.
Best regards,
Ivor Lewis. Redhill, South Australia
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