Save game here. The object of the puzzle is to lower (L-R) #3 column to no water seen. This can be done in several ways. Note the height of the columns when one of the wheels is turned. Note that (L-R) columns 1 and 3 can be raised to the highest point before all the wheels can not be turned anymore. Note that the last column #4 can be raised only midway before locking all the wheels. The best strategy is to lower #4 column enough to allow #1 and 3 columns to be moved. This is one way to do this puzzle if the wheels are not yet turned. So if you have touched the wheels – go back to a saved game and then turn from L-R wheels:  Wheel #2 – left click once. Wheel #1 – right click 7 times. Wheel #4 – left click once. If correctly done, you will hear a glurb glurb and Samuel will say READY!

Here are other possible ways to drain the fountain:

Click valve number 1 two times, right click valve number 2 three times, click valve number 3 once, and right click valve number 1 once
Click valve number 1 two times, right click valve number 2 two times, click valve number 3 two times, right click valve number 1 once, right click valve number 3 once, right click valve number 1 two times.
Click valve number 1 two times, number 2 three times, number 3 three times, number 2 two times and number 1 once
Samuel will say, “Ready!” when it is drained.