and 2 a separate oscillation motor 46 may be directly attached to each drive shaft 24 eliminating the need for cables 50 or other linkage the rotational position of each fan 12 may be sensed by a position indication device 56 which may be mounted either at each individual fan 12 or because fewer position indication devices 56 are required at the oscillation motor 46 which drives a circuit of fans the position indication device 56 is adapted to produce a signal in response to the rotation i e oscillation of the fan 12 as monitored directly from the fan 12 or in response to the rotation of the shaft of the oscillation motor 46 a position indication device 56 at either location will provide a signal indicating the rotational position of each fan 12 being oscillated by the oscillation motor 46 the output signal from the position indication device 56 may be transmitted to local control panel 54 or to a remote panel an acceptable position indication device is a series 755 encoder available through encoder products corp of sand point id or a rotary cam available through electro cam corp of concord ontario the disclosed apparatus may also comprise means for injecting water droplets into the air stream 22 of the fan 12 one means of injecting water droplets into the air stream 22 comprises delivering water to a mist ring 58 of each fan 12 through a high pressure water line 48.