A pendulum is a small weight attached to a length of thread or chain. It’s a remarkable, deceptively simple instrument that can reveal information not able to be obtained in any other way. It can also be used for many other purposes, such as answering questions, continuing spiritual healing, enhancing inner growth, eliminating negativity, sending energy, and setting intentions. The pendulum is a dowsing instrument. The word dowsing means to detect hidden substances, usually with the help of a forked stick, L-shaped metal rod, or pendulum. Many people dowse with their bodies instead of using a dowsing instrument (see Appendix). The pendulum has been used for thousands of years. The ancient Chinese used them to deter evil spirits, and thousands of years ago, ancient Egyptians used them to determine where to plant their crops (Copen 1974, 20–21). In his history of the Roman Empire, Ammianus Marcellinus (c. 325–391 CE) wrote about a plot to assassinate the Roman Emperor Valens. A ring attached to a fine linen thread was suspended over a circular platter that contained the letters of the alphabet. The ring moved and spelled out T-H-E-O. This told the conspirators that the next emperor would be Theodorus. The conspirators were caught and executed before they were able to kill the emperor (The Roman History of Ammianus Marcellinus, 000IX, 29).