COKE, CHARCOAL, PEAT CHARCOAL.

These are similar substances produced by like processes from coal,

wood, and peat and they vary in their steam-producing power according

to the power of the fuels from which they are produced. The method by

which they are made is termed carbonization, which means that all the

gases are removed by heat in closed vessels or heaps, leaving only the

carbon and the more solid parts like ashes.