Liquid Fuel
Liquid fuel, as petroleum, is used in a furnace specially constructed for the purpose. The oil is forced into the fire-box along with air or steam. Some have an injection placed above the fire-door, through which the liquid hydrocarbon is introduced. A cock regulates the supply, and at the mouth of the orifice superheated steam is associated with the petroleum at a temperature of 600 deg. F. The hot ashes on the grate-bars receive the combined spray, and ignition takes place. See FUEL; PETROLEUM. Litharge is the fused oxide of lead. See RED-LEAD.