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, slowly increasing to an average of 90 minutes apart today.
- Clyde Max Bauer and George Marler (1939). "Old Faithful, An Example of Geyser Development in Yellowstone Park". Northwest Science 13: 50–5.
- Harry R. Woodward (1939). "Season Report on the Naturalist Activities at Old Faithful Station.".
- "Old Faithful". The Geyser Observation and Study Association. 2007-09-20. Retrieved October 7, 2007.
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