geog5839.14, the history of dendrochronology
TRANSCRIPT
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October 25
The history of dendrochronology
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RINGS IN THE BRANCHES OF SAWED TREES SHOW
THE NUMBER OF YEARS AND, ACCORDING TO THEIR
THICKNESS, THE YEARS WHICH WERE
MORE OR LESS
DRY.
“ ”
Leonardo da Vinci
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Photograph: Anshul Nigham
... and if one forces a stone or similar object into a tree, it becomes hidden, since the new growth surrounds it, as was the case with the wild olive treewhich stood in the market place at Megara.
“ ”Theophrastus (371 - 287 BC)
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Henri-Louis Duhamel du Monceau1700 - 1782
Georges-Louis Leclerc, Comte de Bu!on1707 - 1788
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Photograph: Fri!s Schweingruber
Frost ring Pinus sibirica
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1737➟1708
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Alexander Twining1801 - 1884
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“...every tree told the same story.”
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Tucson, AZ
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ANDREW ELLICOTTDOUGLASS
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Flagsta!, AZ
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Andrew Douglass (right) Flagsta! 1898
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Source: Sam Wise
Lowell Observatory Flagsta! Arizona
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Source: Schiaparelli (1888)
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Tucson, AZ
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Photograph: Howard Arno!
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Photograph: Christine and John Fournier
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We do not know how old these ruins are, but I should be glad to have an opinion from you as to whether it might be possible to connect up with your modern and dated trees specimens [with wood specimens] from these [prehistoric] ruins by correlating the curves of growth…
“ ”Clark Wissler to A.E. Douglass
1909
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Aztec Ruin
Publo Bonita
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Source: Sco" Catron
Aztec Ruin National Monument New Mexico
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Source: Chris M
Pueblo Bonito New Mexico
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Pueblo Bonito New Mexico (before it was excavated)
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Source: Stones 55
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Wupatki New Mexico
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1900180017001600150014001300
Living-tree chronology
‘Floating’ chronology
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National Geographic ‘Beam Expeditions’ 1923 and 1929
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Show Low, AZ
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$5for
100 rings
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$65for
100 rings2011 dollars
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1900180017001600150014001300
120011001000900800700
Living-tree chronology
‘Floating’ chronology
HH-3913801237
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For the three of us, the experience was unforge"able. To be present at the instance of the celebrated breakthrough in science that set the chronological house in order for the Southwestern United States was reward enough. But beyond that, was the privilege to work for a time at the side of Douglass, the scholar, the astronomer turned archaeologist.
“ ”Emil Haury
1962
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Tree-ring display at elementary school
Photograph: Tom Swetnam
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