English: Irrigation system "Perrot" from firm Perrot, Calw, Germany:sprinkler and end fitting. The diagonal, silver stripe from the annotated blast pipe in the middle to right above is the waterjet, produced by the sprinkler Above the blast pipe, also in the middle of the picture, the mechanism, which, produces the rotation of the blast pipe round the vertical axis of the sprinkler. It's an counterwheigted crank, that in an oscillating motion periodical would be hit by the waterjet and so gives the sprinkler blast pipe an radial moment fo force to move an angle bracket further. The high speed accelerated water jet and the oscillating crank are in case of motion volitional not sharp repoduced, in matter of showing the besides the blast pipe only stiring parts of the complete system.