Abstract: A method and apparatus for continuously producing charcoal and graphite of selectable varying degrees of volatile content from all types of waste wood, bark and vegetable matter are disclosed. The method uses horizontal force fed retorts arranged in tiers of rows across the width of a refractory oven. Because it can use various organic material, including wood waste, mixed up with bark in any ratio, the invention provides a solution to the forest industry waste proliferation problem. Organic material is carried through the retort by a screw which has its flights interrupted in gas collection areas. Loose plugs of organic material form in the gas collection areas and prevent the escape of gases by way of the ends of the retort. Gases are collected by gas vents which connect to the retort in the gas collection areas.