It can be precisely irrigate a precisely adjustable rectangle. The rectangle as Gesammtes can be beyond even scale by adjusting the amount of water.
The only criticism would be the principle of the sprinkler; By the pivoting of the apparatus, the center of the rectangle is much less watered in relation to the edges (in pivoting direction). But since this applies to all swinging Regner, you can deduct for any star.
Compared with other devices of this device is very convenient.
