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I saw a different technique the other day on that 'Jane Goldman investigates' program for finding a hidden object in a room. They drew a basic floor plan of the room (including features like windows, door etc) and then took a ruler which was slowly moved north to south. When the pendulum started to give a 'yes', a line was drawn. The same was repeated but moving east to west on the diagram. Where the two lines intersected is where the object was hidden. I thought it was quite interesting and worth a mention here.