Abstract: An improved nozzle for use in a cooling tower comprises a connecting member defining an orifice and a spinner rotably mounted on the connecting member so that liquid passing out of the orifice impinges on and thereby rotates the spinner. The spinner defines a plurality of arms projecting from a central section, each arm being spaced from adjacent arms by grooves or slots. The trailing edges of at least some of the arms are inclined at an angle of 10.degree. to 25.degree. with respect to the travel direction of liquid passing out of the orifice. With this construction, liquid to be cooled can be sprayed into the cooling tower in the form of a substantially uniform pattern of very fine droplets.