The invention relates to irrigation by means of sprinklers for agriculture, lawns, golf courses and other applications. More particularly, the invention provides a sprinkler arranged to distribute water evenly over a field area of almost any shape. Preferably the invention relates to a pop-up sprinkler thus, when not in use, i.e., when no water pressure is applied, the entire device is level or below ground surface. The invention comprises: a lower water inlet, an inner member, within an upper housing, suspended on a vertical axis within the lower water inlet. An inner member within the upper housing being free to revolve around a vertical axis and revolvably supporting; at least one nozzle assembly having at least one water inlet and an outlet jet and being supported on a horizontal axis. Means for variably tilting the nozzle assembly(ies) in a horizontal axis in accordance with the changing angular position of the nozzle around the central vertical axis when water pressure is introduced into the lower water inlet housing. And means for imparting a vertical axis rotary movement to the inner member part within the upper housing directly supporting the at least one nozzle assembly.