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A 'Wire' is an uncommon type of 3rd order triangulation mark.

7 instances are recorded in the OSGB36 list [1] and all are associated with Colliery headgear. In T:UK the 'Wire' marks, along with marks of other types, occur within 3 triangulation stations. These stations have all beeen destroyed and there are no known photographs.

The trig stations which included these 'Wire' marks were:

Algernon Colliery Headgear (West and East ropes),
Reedley Colliery Shaft Centre (West, East, South and North Wires),
Watnall Colly


  1. https://www.ordnancesurvey.co.uk/legacy/docs/gps/CompleteTrigArchive.zip