Since the line of actions of hydrostatic forces applied on the curved surfaces passes through the pivot point, the forces have no effect on the moment. This moment can be counterbalanced by adding weight to the weight hanger, which is located at the left end of the balance arm, at a fixed distance from the pivot. The knife edges coincide with the center of the arc of the quadrant therefore, the only hydrostatic force acting on the vertical surface of the quadrant creates moment about the pivot point. The quadrant is mounted on a balance arm that pivots on knife edges. The water tank has a drain valve at one end and three adjustable screwed-in feet on its base for leveling the apparatus. The equipment is comprised of a rectangular transparent water tank, a fabricated quadrant, a balance arm, an adjustable counter-balance weight, and a water-level measuring device (Figure 1.1).
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