Incomplete Combustion.

• Carbon = 12 parts by weight

• unites with oxygen = 16 parts by weight

forming carbon monoxide = 28 parts by weight. This gives off only 3–10ths of the heat in the fuel. Now we know 2 atoms of oxygen are required to complete combustion with one atom of carbon bring in more air, and you get—

• carbon monoxide = 28 parts by weight

• unites with oxygen = 16 parts by weight

• 44 parts by weight

which gives off the remaining 7–10ths of the heat in the fuel.