Reid Harvey on tue 5 jan 99
Can anyone tell me how the folks at Orton Cones went about deciding how
many degrees between cones? For example, some cones are 10C above the
next cone, while others are, say 40C above. Why not just have, say 25
degrees between cones?
Doing a ^010 firing yesterday, I made the cone pack to include ^s 014
and 012 as well. But I noticed in an Orton cone table that while ^012
was 884C, both ^011 and ^010 were 894C. Both cones at the same
temperature? Why? There's a similar thing happening around ^01 and ^1, a
very small temperature difference between the two. What kind of
chemistry/ physics may be happening at those temperatures?
Maybe I'm losing my memory (or mind). I'll look in a book. I've
forgotten where the crystal structure changes happen, alpha beta quartz,
etc., but still cannot quite account for these temperature differences.
Reid Harvey, who usually claims to have the answers.
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