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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). Calipers or rulers, for measuring the actual dimensions of the quadrant.Armfield F1-12 Hydrostatic Pressure Apparatus,.EquipmentĮquipment required to carry out this experiment is the following: The forces which create these moments are the weight applied to the balance arm and the hydrostatic force on the vertical surface. In this experiment, the hydrostatic force and center of pressure acting on a vertical surface will be determined by increasing the water depth in the apparatus water tank and by reaching an equilibrium condition between the moments acting on the balance arm of the test apparatus. To determine, both experimentally and theoretically, the center of pressure.To determine the hydrostatic force due to water acting on a partially or fully submerged surface.The objectives of this experiment are twofold: Hydrostatic force and its line of action is also required for the design of many parts of hydraulic equipment. The location and magnitude of water pressure force acting on water-control structures, such as dams, levees, and gates, are very important to their structural design. The center of pressure is a point on the immersed surface at which the resultant hydrostatic pressure force acts. Calculation of the hydrostatic force and the location of the center of pressure are fundamental subjects in fluid mechanics. Hydrostatic forces are the resultant force caused by the pressure loading of a liquid acting on submerged surfaces.