A Guthrie rolling bridge was a kind of retractable bridge, an 18th century version of the drawbridge. It was commonly installed as the access across the narrow steep sided ditches characteristic of the polygonal forts of this era.
Rolling bridges were unhinged, and remained horizontal as they were retracted within the gates of a fortification, similar in operation to a modern thrust bridge.
Read more about Guthrie Rolling Bridge: Running The Bridge Out, Running The Bridge In, The Bridge Adopted By The Military, Locations
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“This land is your land, this land is my land, From California to the New York Island. From the redwood forest to the Gulf Stream waters This land was made for you and me.”
—Woody Guthrie (1912–1967)
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Tired of his dark dominion, swung the fiend
Above the rolling ball in cloud part screened,”
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—Audre Lorde (1934–1992)