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At 06:02 13/01/2007, you wrote: >Am I correct in assuming that Patent Fuel was coaldust mixed with >tar etc as briquettes ?.. John, What period are we talking about? Production of briquettes using tar was not always successful. They tried it with anthracite dust at Hook Colliery, in Pembrokeshire, UK, and it was apparently a failure. The tar blocks were lying about for years afterwards - birds would stick to them in hot weather. 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 Research Fellow - School of Geography, Archaeology and Earth Resources Hon. University Fellow - School of Humanities and Social Sciences Office address - Department of Archaeology, University of Exeter, Laver Building, North Park Road, EXETER, EX4 4QE Tel. +44 (0) 1392 263709 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/ _____________________________________________