Shive Wave Machine - Superposition Of Pulses
To demonstrate constructive and destructive interference using pulses.
Shive Wave Machine with end clamp as required..
Starting identical pulses from both ends simultaneously, either in or out of phase, they can be observed as they pass. For two identical pulses, move your hand rapidly down and up at the center of the machine. The two pulses created will reflect off the ends and interfere as they cross each other on their return. Repeat this with one end clamped to get a phase reversal of the pulse which reflects off that end.
B. A. Burgel, Dispersion, Reflection, and Eigenfrequencies on the Wave Machine, AJP 35, 913-915, (1967).