Provided is a pulse radar device which can attenuate an interference signal and significantly amplify a reflected wave without saturating the interference signal. The first and second poles communicate magnetic flux across a gap with opposing end facing surfaces of the body. A second surface opposite to the first surface is provided with external connection terminals. In two-cycle engines, upper and lower seals are provided in addition to any compression rings. The grille runs continuously through all the threshing rotors and includes a plurality of waves parallel to each other and defining peaks and valleys. The apparatus also includes at least one laser that provides energy to the ionized gas within the chamber to produce a high brightness light.