[Old Professer]

I would imagine you could set it up with a two arm sprinkler and a fitting sealed to and through the bottom of the tank that could be connected and disconnected to a garden hose.

Connect the hose, turn on the water and fill the tank.

Then disconnect the hose and let air pressure force the water out of the tank through the openings in the bent arms, which direction will the sprinkler turn?

Will it turn at all?

What if you seal one end of an arm?

[thulldud]

I remember the way that dirty rascal set me up and then dashed my hopes in his account of that experiment.

When they pressurized the bottle the top of it separated and came off with a bang and a massive gout of water. All this in the high-energy physics lab, of course, which got Feynman warned off with the order to take his "freshman experiment" elsewhere.

He never did tell which way the thing turned.