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Tree-rings are easy to observe in the cross-section of most sawn tree trunks.Each ring is one of the many concentric bands surrounding the pith and all are more or less distinguishable from each other.The oak slice from the Tredyffrin double log crib English Lake District style bank barn located near Devon in Chester County, Pennsylvania was dendro-dated to 1779.This barn type is an extreme rarity in Pennsylvania.It never happened, and my copy, a gift from the author, is one of those he wished to modify, but didn’t.Eric loved bells, and noted that under ideal conditions their rings can be heard nine miles distant.They are the result of cell formation outwards from the pith (the oldest part of the tree).One ring is produced each year (except in some tropical, subtropical, or other difficult areas), within the growing season.

These records include evidence for both cataclysmic events and patterns of climate change over time, both at local and regional levels.The oak slice from the Taylor stone Lancashire style ground barn located just west of West Chester in Chester County, Pennsylvania was dendro-dated to 1752.This date established the structure to be the earliest basically intact and scientifically verified barn in all of Pennsylvania.He said, “The far-away sound of a bell could be both “forlorn and soul-stirring.” Funny I remembered that.I acquired this generic cast iron train bell from Eric.This chronometric technique is the most precise dating tool available to archaeologists who work in areas where trees are particularly responsive to annual variations in precipitation, such as the American Southwest. These cross-dated sequences, called chronologies, vary from one part of the world to the next. Douglass pioneered the science of tree rings in this 1929 article titled "The Secret of the Southwest Solved by Talkative Tree Rings." Includes numerous fascinating historic photographs.