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http://www.wikihow.com/Use-Dowsing-or-Divining-Rods
Pendulum Dowsing
Calibrate the pendulum. Hold it perfectly still over a bare surface, then ask a specific question to which you know the answer is "yes". Does it go in a circle (if so, clockwise or counter-clockwise?), swing right to left, or swing up and down? This is your "yes" answer. Repeat to find a "no" answer. If your goal is to find a lost person or object, hold the pendulum over a picture of that person or object and see what the pendulum does.
Hold the pendulum over an object or person and make a request. The simplest way to use a pendulum is to ask a specific, yes or no question and see what the pendulum does. A dowsing pendulum can also be used in other ways:
For map dowsing, hold the pendulum still over the map and make a request (e.g. "Show me where this object or person is"). Move the pendulum slowly over all areas of the map until you see activity that coincides with your calibration. This type of dowsing was used by the German Navy in Nazi Germany.<9>
Write several answers on a piece of paper, leaving the center blank. Hold the pendulum over the center and ask a question. Watch the pendulum carefully to see in which direction it swings. Which answer does it point to? (This is similar to using an ouija board.)
Radiesthesia is the practice of using dowsing to make a medical diagnosis. A common technique is to hold the pendulum over a pregnant woman's stomach to identify the gender of the child. It's not wise, however, to depend on a pendulum for medical advice.