Harry Woodward (naturalist)

Harry Woodward was a US ranger naturalist who, in 1938-9, first described a mathematical relation between the durations and intervals of eruptions from the Old Faithful Geyser. Intervals between eruptions can range from 45 to 125 minutes, averaging 66.5 minutes in 1939,[1][2] slowly increasing to an average of 90 minutes apart today.[3]


  1. Clyde Max Bauer and George Marler (1939). "Old Faithful, An Example of Geyser Development in Yellowstone Park" (PDF). Northwest Science. 13: 50–5.
  2. Harry R. Woodward (1939). "Season Report on the Naturalist Activities at Old Faithful Station.".
  3. "Old Faithful". The Geyser Observation and Study Association. 2007-09-20. Retrieved October 7, 2007.

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