Abstract: A linearly movable irrigation system, according to the present invention, may include a plurality of interconnected power driven irrigation spans supporting a water supply conduit, which sections are capable of moving over a land area and depositing a controlled amount of water thereon. At one extremity of the irrigation system may be provided a steerable and powered mover unit that accepts water from a water supply system and conducts it to the overhead irrigation pipe under sufficient pressure to cause proper distribution of water through sprinkler devices located along the length of the irrigation conduit. A power driven pump may be supported by the steerable mover unit in order to pressurize or provide boosting pressure for the water received from the water supply. The steerable mover unit is adapted to steerably move in proximity to an elongated reference which may be straight or curved as desired.

Abstract: Irrigation sprinkling apparatus according to the present invention may include structural means for supporting at least a portion of a mobile sprinkling apparatus that is adapted in use for rotation about a fixed point for irrigating a generally circular ground area. Each of the mobile base structures for the irrigation apparatus will include ground contacting elements such as wheels, tracks or other devices that serve to propel the respective mobile base over the land area during irrigation operations. Each of the ground contacting elements is supported for rotation relative to the respective portion of the mobile base to which it is connected and is positionable in an operating position that substantially establishes an arcuate track about said fixed point during irrigation operations and is rotatable substantially 90.degree. from said operating position for allowing substantially linear movement of said irrigation sprinkling apparatus.