Clutch plates are used to connect and disconnect driven part from the driving part temporarily. This apparatus demonstrates the concept of clutch friction using different types of clutch plates.
It consists of flat disc of leather against which a clutch plate is loaded. The clutch plate is secured by screws to the effort pulley. A torque is applied to the effort pulley by dead weight using a spreader beam and two load cords. The main load on the effort pulley and thus the clutch plate is applied by a loading arm system via a thrust bearing.