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At 01:00 05/02/06, Jerry L. Bryant, RPA wrote: >I tried to send you a photo of the artifacts in question, but the list >server had objections. Jerry, The list is set to reject attachments - send them direct to Trevor - his address will be in the message header. Trevor, The ore hearth, which we believe was the process being used at Combe Martin from the late 16th into the 17th century, was, on the evidence from Derbyshire and Yorkshire, stone built with no clay lining. The key component in the hearth was the workstone, set at the base of the hearth, which allowed the smelter to bring partially smelted ore forward into an oxidising atmosphere, initiating the chemical process which released the metallic lead (the roast/reduction process). One would expect the stonework of the hearth to be vitrified. Peter Peter ______________________________________________ Dr Peter Claughton, Blaenpant Morfil, nr. Rosebush, Clynderwen, Pembrokeshire, Wales SA66 7RE. Tel. +44 (0)1437 532578; Fax. +44 (0)1437 532921; Mobile +44 (0)7831 427599 Hon. University Fellow School of Humanities and Social Sciences (Centre for South Western Historical Studies) University of Exeter E-mail: [log in to unmask] Co-owner - mining-history e-mail discussion list. See http://www.jiscmail.ac.uk/files/mining-history/ for details. Mining History Pages - http://www.exeter.ac.uk/~pfclaugh/mhinf/ _____________________________________________