Guthrie rolling bridge

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.

For the London "curling" bridge, see The Rolling Bridge. For an example of the rolling bascule bridge, see Pegasus Bridge.

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.

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