Melde's apparatus

Specifications

For showing the effects of vibrations in a stretched cord and investigate the relationship between frequency, tension and density. In addition, the presence of electrical contacts, opened and closed by a vibrating armature, allows the apparatus to be used as high-speed changeover switch in.
Composed of a thin steel rod mounted on a in a clamp formed by a pair of 4 mm terminal sockets, 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 bosshead and clamp serves for tying the cord and also as the moving contact when the apparatus is operating as a changeover switch.
Switch-mode power: 110-220V