This unit is designed to determine the time period of spiral spring and its frequency. Spiral spring is a type of spring which is formed by a metallic strip wound around a rod at same point.
The apparatus consists of a shaft on which the spiral spring is attached. A metallic rod, containing masses at its edges, is used to deflect the shaft. The deflection can be measured through a protector and the extent to which the spring was deflected initially can also be found.
 Investigation of vibrations on a spiral spring-rotating mass system
 Axis mounted on ball bearings
 2 levers with sliding weights
 Spiral spring
 Integrated angle measuring scale mounted on axis
 Wall mounting plate made of anodised aluminium