Martin Howard on fri 1 sep 00
Does anyone know just where I can find the background details of the Cushing
Glaze Limits?
I would really like to study Cushings reasoning and then see how far I can
stretch those limits, in theory and practice.
Martin Howard
Webb's Cottage Pottery
Woolpits Road, Great Saling
BRAINTREE, Essex CM7 5DZ
England
martin@webbscottage.co.uk
John Hesselberth on fri 1 sep 00
Martin Howard wrote:
>Does anyone know just where I can find the background details of the Cushing
>Glaze Limits?
>
>I would really like to study Cushings reasoning and then see how far I can
>stretch those limits, in theory and practice.
>
Hi Martin,
Cushing's glaze limits, like all other published sets of limits, are
based on a combination of personal observations plus drawing on what
others before him have done. For the most part they describe an area
that gives "good glass" -- and nothing else. There is no science behind
them, only empirical observation. Every single author that has published
sets of limits like this will tell you, as Cushing does, that they are
only intended to be guidelines.
My own research tells me that you are much more likely to make good
stable glazes "within limits", but some stable glazes do exist that are
outside of limits.
I got curious about the original work that lead to glaze limits and did
an extensive literature seach on the subject a couple years ago. I went
back to the work of Herman Seger and worked forward from there. You can
find that documented on my web site at:
http://www.frogpondpottery.com/glazestab.html
John Hesselberth
Frog Pond Pottery
P.O. Box 88
Pocopson, PA 19366 USA
EMail: john@frogpondpottery.com web site: http://www.frogpondpottery.com
"It is, perhaps, still necessary to say that the very best glazes cannot
conceal badly shaped pots..." David Green, Pottery Glazes
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