This apparatus is designed to verify the parallel axis theorem of moment of inertia. It consists of a 30 cm diameter aluminium disc with a 50 cm graduated aluminium channel attached at its center of gravity. The system is suspended from a sturdy wall bracket using a wire. Two adjustable weights can slide along the channel, allowing precise positioning at equal distances from the disc's center. The apparatus is supplied with two set of 200gm & 500gm weights.