The L-shaped wire used for dowsing is called a dowsing rod. Dowsing is a technique for detecting underground water and metal veins. Additionally, pendulums were also utilized for this purpose.
The best-known method of dowsing is to lightly hold two L-shaped wires in one's hands and, while keeping them parallel to each other, roam around freely. If the wires at last swing apart or intersect, there is a possibility that a vein of water or metal lies underneath.
This phenomenon is said to be due to the human brain perceiving some kind of external information and subconsciously moving the muscles.
According to some theories, the human brain contains an internal magnet called a 'bio-magnet', which takes in the magnetic field generated by substances lying underground or the ionization of water, and transmits this information unconsciously to the muscles.
Dowsing has existed for over 4000 years and is believed to have been used by the founder of the Shingon Buddhism sect, Kuukai. More recently, dowsing is said to have been used by the US military to find land mines during the Vietnam War.
Furthermore, it is said that in some parts of Tokyo, public authorities still use it to detect water pipes.
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