WILLIAM DELBERT GANN (1878-1955), or W. D. Gann, was a finance trader who developed the technical analysis tools known as Gann angles, Square of 9, Hexagon, Circle of 360 (these are Master charts). Gann market forecasting methods are based on geometry, astronomy and astrology, and ancient mathematics. In this book written just after the outbreak of the Second World War, the author traces the patterns that he believed would underlie the future to 1950. Prescient and deeply thought-out a fascinating read