Pivots are irrigation devices that pivot around a huge lump of concrete. They can be many units long and the wonders of electric motors and GPS keep them in line while performing a 360° circle issuing water to the crops.
Friends who have flown to Hobart in summer say the countryside has been transformed by these units and new irrigation schemes to dot the place with green circles sitting in the brown countryside.
This one is resting. When in use it waters the paddock through 180° or a half-circle. The concrete pivot point is at the other end. To make sure the thing stops, the final pivot section (closest to the trike) has a detector lever that hits the post (arrowed) and turns it off. In case the GPS / motor system doesn’t keep all units in a line, there are other posts and levers down the line to make sure it doesn’t drive on though the fence and onto the road.
Each summer more and more of these things appear. Most of them shoot water over the road from the end spray. This is managed by signs on the road – “Irrigation Spray for the next … kilometres”. Welcome on a hot day!