A metallurgical furnace, which includes a furnace shell, an exhaust system, and a gas cleaning system, further includes a plurality of improved pipes and fume ducts throughout to increase operational life and productivity. The force generating apparatus includes a force applying element coupled to the moving element for applying the force to the moving element and an actuator coupled to the force applying element for actuation thereof in response to receiving the electrical force signal. Further, one of the first control unit and the second control unit includes a transmission section for transmitting the first operation data and the second operation data to a computer at a predetermined timing. The first plurality of tread channels are formed into the tire uniformly spaced circumferentially around the tire and extending inward from one of the sidewalls less than the entire distance across the width. A second comparator looks at the return address stored in the third location and the return address stored in the first location in the stack memory and has a second interrupt generator for generating an interrupt signal if addresses are not the same. Methods for using compounds that inhibit human DNA ligases to provide insights into the reaction mechanisms of human DNA ligases, for example to identify the human DNA ligase involved in different DNA repair pathways.