Copy letter from Robert William Frederick Harrison, to the Editor, 'The Gas & Oil Engine Record' The paper by L Bairstow & A D Alexander on 'Explosions of Mixtures of Coal Gas' et cetera, was published in the 'Proceedings of the Royal Society', volume 76, number A511. It may be obtained from Messrs Harrison & Sons, 45 St Martin's Lane, W.C. at two shillings and six pence. No objection would be made to quotation. 18 August 1905