The apparatus consists of a sturdy base plate with two verical uprights that can be twisted about a vertical axis. Suspended between these supports is a shaft and at each end of the shaft is an identical Hooke's coupling. The axis of each coupling can be independently varied relative to the main shaft axis.
Each support has two protractors. One in a vertical plane and the other in a horizontal plane. When the supports are rotated about their vertical axis the angular position can be monitored using the horizontal protractor and pointer. When the main shaft is rotated the angular position is monitored using the vertical protractor and pointer. These pointers and protractors ensure that the angular difference between the input and output shafts can be determined for a range of shaft angular positions. A wide variety of angular settings for single or double couplings are possible.
The pointer can easily be moved relative to their protractors. The angular position of the coupling axes can be quickly adjusted using the quick release knobs.
A comprehensive instruction manual for lecturer and student, giving full details on apparatus assembly and operation as well as example results. All necessary assembly and operational tools are provided.