Harry Woodward was a
US ranger
A Ranger is typically someone in a military/paramilitary or law enforcement role specializing in patrolling a given territory, called “ranging”. The term most often refers to:
* Park ranger or forest ranger, a person charged with protecting and ...
naturalist who, in 1938–9, first described a
mathematical relation between the
durations and
intervals of
eruption
Several types of volcanic eruptions—during which lava, tephra (ash, lapilli, volcanic bombs and volcanic blocks), and assorted gases are expelled from a volcanic vent or fissure—have been distinguished by volcanologists. These are often ...
s from the
Old Faithful Geyser
Old Faithful is a cone geyser in Yellowstone National Park in Wyoming, United States. It was named in 1870 during the Washburn–Langford–Doane Expedition and was the first geyser in the park to be named. It is a highly predictable geothermal ...
. 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.
References
American naturalists
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