Dowsing

This report item is a reading of a dowsing session, question by question. The historical practice is described on its own terms, and the reading states plainly that the ideomotor effect, small unconscious muscle movements of the dowser, is the explanation supported by controlled tests, so this is offered as a reading of the session and not as a way of locating water, minerals or answers.

History

Using a forked rod, and later a pendulum, to search for water, minerals or other hidden things is documented from at least the German mining regions of the late medieval and early modern period onward, most notably described in Georgius Agricola's 1556 mining treatise De Re Metallica, and the practice spread from that mining context into wider folk use over the following centuries.

The ideomotor effect, small, involuntary and unconscious muscle movements a person makes without perceiving themselves making them, is a well documented psychological phenomenon in the scientific literature reaching back to nineteenth century investigation, William Benjamin Carpenter's 1852 account being an early and influential statement of it, and it is the explanation controlled tests have consistently supported for how a dowsing rod or pendulum actually moves in a dowser's hands. That is a separate finding from the claim that dowsing can locate water, minerals or answers at better than chance accuracy, a claim controlled trials have not supported; this page states that distinction plainly rather than blurring the two.

How A Reading Is Constructed

A reading works through a dowsing session question by question, describing what the session itself contained and how a dowser's tool responded, without presenting the session as a demonstrated way of locating water, minerals or answers, since controlled testing supports the ideomotor effect as the explanation for the tool's movement rather than supporting the separate claim that dowsing finds hidden things at above-chance accuracy.