The following is a list of the sources I have used to compile this web-site.
NCB (1981); "Mine Gases", Pub. Industrial Training Branch of the NCB, Revised Second Edition, 1981.
Watson, W.F. (1999); "The Invention of the Miners safety lamp: A reappraisal" , Trans. Newcomen Soc. 70 (1998-1999) p 135-141