A chamfered narrow side copper plate for a mold with a funnel-shaped curved surface has a working face contacting molten steel that includes a middle area and two chamfered areas, which are arranged at two sides. When gradation is expressed with an n bit, bits each of which is shown by a binary of the gray scales are divided into three bit groups, and one frame is divided into two subframe groups. By marking the scrap tires with a unique identifier, the scrap tires can be tracked on their way to the final destination. Each row has a plurality of radiation source assemblies in spaced relation in a direction transverse to the direction of fluid flow, to define a gap through which fluid may flow between an adjacent pair of assemblies. The engine speed is immediately set to the operating speed once again, when the motor requires a moment of strain at a certain period of time to maintain simple and comfortable operating procedures. The head restraint is pivotable relative to post.