Posted by PeterH on June 17, 2006 at 07:01:07 from 86.130.134.78 user Peter_H.
In Reply to: Re: Pommies and ceramic science posted by PeterH on June 16, 2006 at 22:37:19:
John - apologies, I was not accurate about crucible clay - the Beckfoot crucible is more likely to have been made from low-fired refractory clay. Dick refers to the 'little earthen lid'. The clay may have had quartz mixed or 'peppered' in it, to give increased resistance to heat. I understand that modern crucibles are made of a graphite composition, but at this point I give way to your knowledge . . . :-)