e167.
William Siemens’ (later Sir William Siemens) 1868 description of UCG was published in the Transactions of the Chemical Society, 21, 279. The final composition of town gas is 56% nitrogen, 25% carbon monoxide, 12% hydrogen and 7% carbon dioxide. See The Oil Drum website at www.theoildrum.com . See also Richard Heinberg (2007), Peak Everything: Waking Up to the Century of Declines, pp 129–132.