NOVELTY - Apparatus comprises (a) a reaction vessel comprising an entry port for introducing organic substance into the reaction vessel, heated metal surface, exit port for discharging solid materials from the reaction vessel, and an exit port, (b) burners located beneath the reaction vessel for heating the metal surface, and (c) motor for rotating the drive shaft to rotate the paddle.    USE - The apparatus is useful for decomposing organic substance (claimed) including coal, oil shale, tar sand, plastic, sewage sludge, agricultural waste, industrial waste, and other by-products, and processing waste rubber tires.    ADVANTAGE - The apparatus has high surface-to-volume ratio, and hence allows high concentration of the organic substance to-be-exposed to the heated surface, and high heat capacity, reduces flow of material, coking, tarring or charring, and is simple to operate, ease in adaptability and maintenance with other systems, and self-cleanable.    DETAILED DESCRIPTION - Apparatus comprises (a) a reaction vessel (1) comprising an entry port (3) for introducing organic substance into the reaction vessel, heated metal surface within the reaction vessel onto which organic substance is introduced to at least one paddle inside the reaction vessel and mounted to a drive shaft for rotating about the metal surface to agitate the organic substance, exit port (10) for discharging solid materials from the reaction vessel, and an exit port for exhausting gases from the reaction vessel, (b) burners located beneath the reaction vessel for heating the metal surface, and (c) motor for rotating the drive shaft to rotate the paddle (6). An INDEPENDENT CLAIM is included for method for decomposing organic substance, which comprises heating a metal surface located in a reaction vessel at 1000-1500 degrees F, introducing the to-be-decomposed organic substance into the reaction vessel and onto the heated metal surface, agitating the organic substance deposited onto the heated metal surface, and further agitating the organic substance for sufficient time to effect ablation of the organic substance, and moving the ablated organic substance to from the ablative surface (4) the exit port.    DESCRIPTION OF DRAWING(S) - The drawing shows side view of the apparatus for decomposing organic substance.    Reaction vessel (1)    Heated enclosure (2)    Entry port (3)    Ablative surface (4)    Paddle (6)    Exit port for discharging solid materials (10)