Digitized content includes diagrammatic figures included in the work, The Chemistry of Combustion Applied to the Economy of Fuel with Special Reference to the Construction of Fire Chambers for Steam Boilers. The nine diagrams depict elements employed and compounds formed in the process of combustion; a representation of the chemical union and combustion of an atom of carburetted hydrogen and atmospheric air; showing how carbonic acid is converted into a carbonic oxide; the combustion of a given volume of hydrogen and its equivalent of oxygen; the combustion of a given volume of carburetted hydrogen and its equivalent of oxygen; the combustion of a given volume of hydrogen and its equivalent of atmospheric air; the combustion of a given volume of carbon and its equivalent of atmospheric air; and the combustion of a given volume of carburetted hydrogen and the equivalent of atmospheric air.