Pendulums and the ideomotor effect

In this lesson: how to use a pendulum, why it moves (the ideomotor effect), the history of dowsing and an honest way to read the swing.

The pendulum is the simplest divination tool there is: a small weight on a chain or thread. It is cheap, quiet and easy to carry, which makes it a lovely first tool. It is also the tool where honesty matters most, because we know quite a lot about why it moves.

Where pendulums come from

Pendulums belong to a wider family of practices called dowsing. In 1556 the German scholar Georgius Agricola described miners walking the hills with forked twigs, searching for veins of ore, in his great book on mining, De re metallica. He was doubtful about it even then. By the nineteenth century people were holding rings on threads over maps, over food and over a pregnant woman’s belly to “see” the baby’s sex.

Why the pendulum moves

In 1852 the physiologist William B. Carpenter gave a lecture at the Royal Institution in London about movements the body makes without the person deciding to make them. He called them ideomotor actions. When you expect a pendulum to swing a certain way, your fingers make tiny movements you cannot feel, and the weight amplifies them into a clear swing. The psychologist Ray Hyman later showed how sincere, honest people are fooled by exactly this effect, because it truly feels as though something outside you is moving the thread.

I find this freeing rather than disappointing. If the swing comes from you, then the pendulum is a way of reading your own body’s quiet leanings. That is useful for small choices and for noticing what you already feel. It is not useful for facts you cannot know, like lottery numbers or another person’s secrets.

The scientists who explained the swing

Historical In 1833 the French chemist Michel-Eugène Chevreul, famous for his work on fats and colors, published a letter describing experiments with a pendulum. He found that the pendulum swung in answer to his expectations, and that when he blindfolded himself or rested his arm on a support, the effect weakened or vanished. He concluded that tiny unconscious muscle movements caused the swing. In 1852 the English physiologist William Benjamin Carpenter coined the term ideomotor action for movements caused by ideas without conscious intention.

Historical The same effect explains dowsing rods, which were already used by miners in sixteenth-century Germany, as illustrated in Georgius Agricola’s De re metallica (1556), and table turning, a craze of the 1850s. In 1853 the physicist Michael Faraday built a device that showed sitters were unconsciously pushing tables. The Ouija board, patented in the United States in 1891, works the same way.

Modern Controlled tests of dowsing, such as a large series in Germany in 1987 and 1988, have not found reliable results beyond chance. That does not mean the pendulum is useless. Because it shows unconscious movements, it can reveal what you already feel but have not admitted.

A pendulum practice that honors both sides

Hold the chain between thumb and forefinger with your elbow resting on a table. Ask the pendulum to show you “yes”, then “no”, and note each movement. Then ask a question whose answer you already know, such as “Is my name Anna?”, to see your signals. Next, ask a question about your own feelings: “Do I want to take this course?”

Watch the movement and then ask yourself honestly whether it matches what you feel. Finally, test a factual question with a friend’s help: they place a coin under one of three cups out of your sight, and you dowse for it. Repeat ten times and record the results. Expect roughly three or four hits by chance. This simple test shows you the difference between a tool for feelings and a tool for facts.

How to use one

Sit with your elbow resting on a table and hold the chain between thumb and finger, letting the weight hang still. Ask it to show you “yes”, wait, and notice the movement. Do the same for “no” and for “I do not know”. Write the three movements down, because they differ from person to person.

A worked blind test

Here is how one learner ran the cup test from the practice above. Her friend hid a coin under one of three cups while she waited in another room. She dowsed over each cup and named the one where the pendulum circled. They repeated this ten times, with the friend writing down the results.

She scored four hits out of ten. By chance alone, the expected score is a little over three. Then they did a second round where the friend also left the room after hiding the coin, so no glance or sigh could give the answer away. This time she scored three.

Her notes: “Four, then three. That is what chance looks like. The pendulum did not find the coin. But when I asked it about my own feelings, it swung strongly towards yes when I asked if I wanted to change jobs, and I knew it was true.” She decided to use her pendulum as a mirror for her own feelings and not as a finder of hidden things. That is exactly the balance this lesson hopes for.

Why the second round matters

The second round, where nobody in the room knows the answer, is called a double-blind test. It matters because people give away information without meaning to, through glances, breathing, small movements or the timing of a word. Clever Hans, a horse in early twentieth-century Germany who seemed to do arithmetic, turned out to be reading tiny cues from his questioners. The psychologist Oskar Pfungst showed this in 1907. When the questioner did not know the answer, Hans could not give it. The same care applies to every divination test.

Pendulum variations

The feelings chart. Draw a half circle on paper and write words around its edge: calm, worried, excited, tired, hopeful, sad. Hold the pendulum over the centre and ask “How do I feel about this?” Then ask yourself whether the word it moves towards rings true.

The pendulum pause. Before a decision, simply hold the pendulum still for a minute while you breathe. Many people find that the act of holding still, waiting, is calming in itself.

The homemade pendulum. A ring or a small key on a thread works perfectly well. You do not need a crystal or any special tool.

Questions beginners ask

Does the pendulum material matter? Crystal, metal or a ring on a thread all work. Choose something you like holding.

Can I use a pendulum for health or money decisions? No. Because it reflects your hopes and fears, it is not reliable for facts. Use it for reflection only.

Why does it work better for some people? People differ in how easily their muscles respond to expectation, and relaxed, focused people often see larger swings.

Myths to drop: A pendulum is not moved by spirits according to any controlled evidence. Cleansing your pendulum does not make it more accurate. And the ideomotor explanation does not make the practice silly; it explains why it can show your inner state.

A worked example

Imagine you are choosing between two journals for your divination notes. You lay them side by side and hold the pendulum over each in turn, asking, “Is this the one I want to write in?” Over the blue one the swing is lively, over the green one it barely moves. You now know something about your own preference that you had not quite admitted. You still check the price and the paper before you buy.

Try this

Tie a ring or a key to a piece of thread about twenty centimeters long. Set your yes, no and do-not-know swings. Ask five questions you already know the answer to, then five you do not, and write down how each swing felt in your hand. Do you notice the difference between knowing and hoping?

Journal prompts: What did my pendulum reveal that I had not admitted to myself? How did I feel when I tried the coin test? How will I use the pendulum honestly from now on?

A beginner’s worry, answered. “If the ideomotor effect explains the swing, is my pendulum useless?” Not at all. It means the pendulum shows you movements from your own body and mind, which is exactly why it can help you notice feelings you have not put into words.

Choosing questions for a pendulum. Good pendulum questions are about you and answerable with yes or no: “Do I feel ready to talk to my sister about this?” Poor questions ask about facts you could look up, about other people’s private lives, or about health and money decisions that need real advice. If a question matters a lot, use the pendulum only as a starting point for your own thinking, then check the facts in the ordinary way.

A variation for anxious minds. If you find yourself asking the same question again and again, set a limit: one question, asked once, then put the pendulum away for the day.

Caring for your pendulum. Keep it in a small pouch or box so the chain does not tangle. A knotted chain can make the swing jerky.

Recap

A pendulum is a weight on a thread, part of the wider history of dowsing that Agricola described in 1556. Carpenter’s work on ideomotor action explains why it moves: tiny unconscious movements of your own hand. That makes it a gentle tool for reading your own preferences on small, everyday choices, and the wrong tool for medical, legal or financial decisions.

What next

Ground yourself first with my grounding and centering practice, because a calm hand gives a clearer swing. The divination overview compares the pendulum with other methods. In lesson 3 we move to runes, a tool with a much older alphabet behind it.

Further reading: Ray Hyman, “The mischief-making of ideomotor action”, The Scientific Review of Alternative Medicine 3 (1999). Daniel Wegner, The Illusion of Conscious Will (MIT Press, 2002).

Sources

• William B. Carpenter, On the Influence of Suggestion in Modifying and Directing Muscular Movement (Proceedings of the Royal Institution, 1852).
• Ray Hyman, The Mischief-Making of Ideomotor Action (The Scientific Review of Alternative Medicine 3, 1999).
• Georgius Agricola, De re metallica, trans. H. C. Hoover and L. H. Hoover (Basel, 1556; English translation 1912).

Go deeper: the tarot and runes pages on this site

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