Ripple Tank - Doppler Effect
To show how wave fronts crowd together in front of and spread out behind a moving source.
Ripple tank with accessories on cart.
The single point source can be moved by rotating the support arm in the photograph. Moving the source uniformly in one direction demonstrates the Doppler effect in a clear and understandable way.
Apparatus Description and Instructions Guide: 2401 RippleTank, Raytheon, Macalaster Scientific Co., Nasua, NH, (1969).