page_title: Guthrie rolling bridge
hierarchical_section_title: Guthrie rolling bridge
caption_attribution_description: English: Lifting arms of Guthrie Rolling bridge at Fort nelson
context_page_description: 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.
context_section_description: 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.
caption: Lifting arms of the Guthrie Rolling Bridge at Fort Nelson
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