Flame Speeds during the Inflammation of Moist Carbonic Oxide–Oxygen Mixtures

IN 19321 we found that the mixture of carbonic oxide and oxygen which gave the maximum speed of flame during the uniform movement was approximately that for combining proportions (2CO + O2), in accordance with the theory advanced earlier2. This conclusion is supported by recent experiments carried out at the U.S. Bureau of Standards by Fiock and Roeder3, using two different methods for measuring the speed of flame, with central ignition (a) in a closed sphere and (b) in a soap bubble. The concentration of moisture was carefully measured and kept constant in each series (a necessary precaution which we emphasised in our paper), but differed in the two series, being 2·7 and 3·3 per cent.