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140-year-old photograph
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He also saw that Halemaumau was only half as wide in 1865 as it is today and more shallow. That was not a surprise, since it is known that explosive eruptions in 1924 greatly enlarged the pit.
Halemaumau is now about 3,500 feet across, set in 3-mile-wide Kilauea.
The back of the old photo had the notation: "First view of the volcano in the 60s," a reference that Swanson realized was to the 1860s.
Who took the photo is not certain. Swanson thinks it might have been shot by William Brigham in 1865, before he went on to head the Bishop Museum.
Brigham later wrote a book that included a description of his horseback trip to Kilauea starting Aug. 22, 1865, lugging a then-rare "photograph apparatus."
The weather was bad the whole time, except for Aug. 27.
That day, some people gathering pulu, the fluffy part of hapuu ferns used to stuff pillows and mattresses, told him "the names of various parts of the crater and legends of various eruptions."
Swanson thinks the photo might have been taken that day, but the Bishop Museum has no records from Brigham to confirm that.
"If any readers have relevant information, we'd certainly appreciate hearing it," his "Volcano Watch" column says.