A backpack type irrigation apparatus having a backpack frame, a pump attached to the frame, an internal combustion engine serving as a driving source for the pump, and a discharge hose connected to a discharge port of the pump. The torque transfer member wedges between the circumferentially-uneven-width-space forming portion and the clutch member while making the torque transfer member contact the clutch so that the rotary input shaft and the clutch member become integral upon rotation of the rotary input shaft. This switch has a number of operational modes. The vapor bubble deflector deflects the rising vapor bubbles away from the surface of the upper segment. Inbred maize lines derived from inbred maize line PHB8V, methods for producing other inbred maize lines derived from inbred maize line PHB8V and the inbred maize lines and their parts derived by the use of those methods. The system includes a first comparator to receive input signals representative of radiation emitted by the moving hot rail car bearing or wheel, and to compare the input signals to a threshold value.