I recently bought a small Slinky spring so as to observe the speed of a wave along its length. I stretched it out quite tightly in a HORIZONTAL position on a spring holder and then plucked at it on one end.
The speed of the wave was incredibly fast as it bounced from one end to the other, eventually dying out. Then I tried the same thing again but with the spring in a VERTICAL position, believing that the force of gravity would have some type of effect on the wave speed.
However, due to the extremely fast speed of the waves, I could not determine whether there was any effect by the force of gravity. Yes, I tried the experiment with the spring stretched out loosely, but then the wave action was very mushy and lethargic, leading nowhere.
I tentatively believe that gravity will affect a rebounding, vertically-oriented traveling wave somehow, probably by assisting its speed downward and then detracting from its speed upwards, making the horizontal or vertical position of the spring irrelevant on the speed of the wave. But right now, this is all conjecture on my part. Therefore: Help please.