A chimney starter or charcoal chimney is a device for igniting charcoal lumps or briquettes. It consists of a metal tube with a grate to hold charcoal. A lighting cone is a similar, conical, device placed over an existing grate. The tube is typically cylindrical, but may also have other cross-sections. The tube may also be made of combustible material designed to resist burning long enough for the coals to ignite. Modern commercial models are usually sheet steel cylinders about 6–8" (15–20 cm) in diameter and 8–12" (20–30 cm) tall. A grate or mesh to hold charcoal is placed horizontally inside the cylinder about 3" (8 cm) from the bottom; this is sometimes conical. Large holes around the bottom let air in. Modern commercial chimneys generally have insulated handles. History A 1910 British design for a cylindrical metal portable stove is described as "also applicable for use as a Fire Lighter" and describes the use of paper kindling below a conical grate, with wood or coal above it. A 1917 design closely resembles a modern chimney starter: a metal cylinder with a raised grate and air holes below the grate. However, it is not described as a fire starter, but as a "camp stove". Home-made versions in the 1950s, called kindle cans, were often made from metal coffee, fruit juice, or motor oil cans with ventilation holes punched with a can opener, and did not have a grate. They often did not have handles, and needed to be handled with tongs. Various kinds of chimney starter have been patented over the years. Design considerations Chimney starters essentially work by increasing the draft, supplying more oxygen to the coals. Taller starters are more effective than shorter ones. In empirical studies of lighting cones for Haitian charcoal stoves (which are placed over a grate rather than having an integrated grate), the ignition time and charcoal consumption were halved compared to lighting on a shallow bed grate, and carbon monoxide production was reduced by 40%. The cone also protected the charcoal from the wind, and helped direct the smoke away from users. Using a chimney starter The chimney starter is used by placing kindling—typically paper—under the grate and charcoal over it. When the kindling is lit, it ignites the charcoal and creates a draft. Since the coals are held together, radiation heats adjacent coals, and convection heats coals higher in the stack. Once