A glass plate and a lens is fitted to a experimental rod A. The Newton Ring lens is adjustable by 3 screws. On applying load at B point, the rod C bends slightly. Experimental rod carries 2 metal plates at different points, increasing the distance between the plate and the lens. Newton's rings are observed before applying the load. As the load is applied gradually the rings run into the centre, disappearing one at a time. A microscope is provided for viewing the rings with cast iron weights set of 500 gms. Without weights