| Description | Including a book outlining special rules to be observed at the Trefrane Cliff Colliery (1889); letters concerning Roch's interests in the preparation of distilled beverages and also the china clay business; a copy of the Explosives in Coal Mines Order (1898); an analysis by the Scientific Department of the British Clay Worker of Clay sample taken from The Infusible Fire - Clay company, based at Llether (1899); plan drawn up by John Whitehead and Company, Albert Works, Preston of a strapfork gear and strapfork gear and scrapers for plan (No date) |