Melde's Apparatus is a simple way to introduce students to the concept of standing waves. The apparatus consists of a string and an oscillator to generate different frequencies. Melde's experiment is ideal to study the behavior of standing waves. Supplied with power supply and accessories - pulley and clamp, scale pan and cord.
This apparatus is used to show the effects of vibrations in a stretched cord and can also be used to investigate the relationship between frequency, tension and density.

The provision of electrical contacts, opened and closed by the vibrating armature, allows the apparatus to be used as a highspeed changeover switch in. Comprises of a thin steel rod armature mounted in a clamp formed by a pair of 4mm socket terminals, so that its free length may be adjusted as desired.
An AC energizing coil surrounds the armature and a permanent magnet provides the necessary magnetic polarization. The free end of the armature equipped with a small boss and clamping screw for attachment of the cord also serves as the moving contact when the apparatus is operating as a changeover switch.
The complete apparatus is mounted on a box type base.