Add versatility to your ripple tank. With simple adjustments on this wave generator, you can produce circular waves from a single point source, interference patterns from two point sources in phase, interference patterns from two point sources out of phase, and straight waves. The long attachment rod screws in the back of the generator and is easily attached to a ring stand. Wave frequency can further be varied by using a variable DC power supply or by using an external rheostat. Operation requires a low voltage power supply that outputs 0-6 V DC, not included. Comes complete with instructions.