How do you set up a ripple tank to measure the wavelength of a wave, frequency and speed of a wave?

Firstly you need a ripple tank which is a shallow tray of water. The water has a vibrating bar inside, that is connected to a power pack. The bar will vibrate, creating waves across the surface of the water. Meanwhile, above the ripple tank should be a lamp and below it; a sheet of white paper. So when the light shines from the lamp through the light, an image of the waves will be produced on the paper. This can be used to measure the wavelength, frequency, and speed of the water waves.