Catalogued
Gann fan and square of nine
- Made by
- William Delbert Gann
- Year
- 1920s-1930s
- Field
- Economics and markets
- Kind
- Computing chart
- Room
- Change over time — Placed by reading its description, not yet studiedCould also hang in: Charts that compute
3 other forms share this skeleton
Source
Gann 1935, The Basis of My Forecasting Method
Attribution less certain: contested, or no single inventor recorded