Joseph Herbert on wed 30 dec 98
There was a thread about cones above 10. It seems to
have subsided now but I will throw a log on, in case
there are still embers in the ashes.
Harry Davis, in Potters Alternative, shows how to make
cone molds and how to make some high cones with four
materials: Quartz, Orthoclase (Potash) Feldspar,
Calcite, and Kaolin. The proportions of these
materials are varied on the basis of the unity formula
for the particular cone. My Lange s Handbook of
Chemistry, 6th edition, 1946 has unity formulae for
cones above 10. For those interested, selected cones
are posted below:
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
Cone 11 - K2O 0.3, CaO 0.7, Al2O3 1.2, SiO2 12
Cone 12 - K2O 0.3, CaO 0.7, Al2O3 1.4, SiO2 14
Cone 13- K2O 0.3, CaO 0.7, Al2O3 1.6, SiO2 16
Cone 14 - K2O 0.3, CaO 0.7, Al2O3 1.8, SiO2 18
Cone 15 - K2O 0.3, CaO 0.7, Al2O3 2.1, SiO2 21
Cone 16 - K2O 0.3, CaO 0.7, Al2O3 2.4, SiO2 24
Cone 17 - K2O 0.3, CaO 0.7, Al2O3 2.7, SiO2 27
Cone 18 - K2O 0.3, CaO 0.7, Al2O3 3.1, SiO2 31
Cone 19 - K2O 0.3, CaO 0.7, Al2O3 3.5, SiO2 35
Cone 40 - K2O 0.0, CaO 0.0, Al2O3 1.0 SiO2 0.0
Using these unity formulae in a glaze calculation
program that is limited to the four materials listed
above should produce a simple recipe for each of the
cone materials.
Joseph Herbert
Joseph.Herbert@att.net
--
Instructional Writer
David Hendley on fri 1 jan 99
Joseph, just wanted to let you know that I make my own cones.
I used Harry D.'s formulae as a starting point, and then
tested my homemade cones with manufactured ones to
fine-tune the recipies.
I use Custer spar, whiting, flint, and clay. I use ball clay
rather than kaolin because you end up with a real
pastey mixture that is not very plastic.
For my cone 06, I use Redart clay because, since manufactured
^06 cones are red, it seemed like the thing to do
(in the old days, before cones were dyed with organic colors,
they were either red or white).
The neat thing about making your own is you can make
them for the exact temperature you want.
For instance, I make "cone 8 1/2", because I want something
that bends a little sooner than cone 9.
Cost for 50 manufactured cones - $4.95
Cost for 50 home made cones - about 10 cents; no charge for
the knowledge and understanding of your glaze materials
gained in the process.
David Hendley
Maydelle, Texas
hendley@tyler.net
http://www.farmpots.com
At 09:39 AM 12/30/98 EST, you wrote:
>----------------------------Original message----------------------------
>There was a thread about cones above 10. It seems to
>have subsided now but I will throw a log on, in case
>there are still embers in the ashes.
>
>Harry Davis, in Potters Alternative, shows how to make
>cone molds and how to make some high cones with four
>materials: Quartz, Orthoclase (Potash) Feldspar,
>Calcite, and Kaolin. The proportions of these
>materials are varied on the basis of the unity formula
>for the particular cone. My Lange s Handbook of
>Chemistry, 6th edition, 1946 has unity formulae for
>cones above 10. For those interested, selected cones
>are posted below:
>
>
>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
>Cone 11 - K2O 0.3, CaO 0.7, Al2O3 1.2, SiO2 12
>Cone 12 - K2O 0.3, CaO 0.7, Al2O3 1.4, SiO2 14
>Cone 13- K2O 0.3, CaO 0.7, Al2O3 1.6, SiO2 16
>Cone 14 - K2O 0.3, CaO 0.7, Al2O3 1.8, SiO2 18
>Cone 15 - K2O 0.3, CaO 0.7, Al2O3 2.1, SiO2 21
>Cone 16 - K2O 0.3, CaO 0.7, Al2O3 2.4, SiO2 24
> Cone 17 - K2O 0.3, CaO 0.7, Al2O3 2.7, SiO2 27
>Cone 18 - K2O 0.3, CaO 0.7, Al2O3 3.1, SiO2 31
>Cone 19 - K2O 0.3, CaO 0.7, Al2O3 3.5, SiO2 35
>Cone 40 - K2O 0.0, CaO 0.0, Al2O3 1.0 SiO2 0.0
>
>Using these unity formulae in a glaze calculation
>program that is limited to the four materials listed
>above should produce a simple recipe for each of the
>cone materials.
>
>Joseph Herbert
>Joseph.Herbert@att.net
>
>
>--
>Instructional Writer
>
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