Depending on impendance that comes in the circuit (R1<R2<R3<R4), on B will go short impulses +12V (0.25 - 1 seconds) in a periods of 3 seconds, responding to R1, up to 14 seconds, responding to R4.
I am trying to improvise the windwasher work, where I can define the pause lenght, by these four values. So the pauses should be proportional to impendances. Lenght of impulse don't need to be precise value, but to be under one wiper period (cycle), so it can be proportional to resistors too.