The apparatus is in two parts namely 1. Experimental Setup and 2. Analogue Field Plotter The Experimental setup consists of a transparent tank of 400-450mm. area and 75 mm depth. In this tank the model under study is to be installed. The model is to be designed as per the requirements out of copper and Bakelite plates. A sample model arrangement will be given with setup. A Probe is mounted on a trolley, which can traverse in two planes fitted on tray to locate equipotential lines. X Y Co-ordinates of the probe at each point can be located on the scale fitted on the cross slide. Necessary potential can be given with the help of Analogue Field Plotter can be displayed on the meter provided.