For those who are interested to know the working mechanism of a water spraying sprinkler. You might have seen this in the gardens where these sprinklers keep rotating and water plants in its surrounding.
The last pic has the close-up shot. There is a central axis holding the apparatus (the axis is protruding in the top as a small white pyramid). Two nozzles are provided to throw out water. (The nozzles have bolts and the main nozzle can be seen with the inscription '27'). Above the nozzle is a strange spoon like structure; this lever is attached to the axis and allowed to rotate around the axis. The lever is bound by a spring.
Ok, let us check them in action. Water flows with considerable pressure from the bottom of the tube and comes out through the nozzles. The main nozzle, which is the bigger one, does the important task. While pumping out the water, water splashes on the edge of the lever. As per the design, the water force makes the lever move away in anti-clock direction. Due to the coiled spring, the lever is pushed back its original position. When the lever comes back, it hits the frame of the nozzle .. making the nozzle structure to move clock wise. This completes one particular angular motion. Again the water is sprayed on the lever, again the lever winds back and springs forward .. this continues to make the sprinkler rotate.
It is amazing to see it in action.
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