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A 'Hole' is an uncommon type of triangulation mark.

16 instances are recorded in the OSGB36 list [1]. Mark descriptions include "Punch hole in roof", "Drill hole in bolt", "Hole in tank rivet", "Hole in washer on roof" and "Hole in iron plate".

Some, but not all, holes are included in stations containing other types of triangulation mark. The station locations include Water tanks, Church towers and Colliery headgear.

T:UK Station name Order Computed Block
TP21494 Bricksbury Hill Water Tank 4 1955 SU77
TP16671 Burradon Colliery Headgear 3 1947 NZ29
TP12571 Danes Hole Water Tank 4 1954 SU31
TP19690 Heath End Colliery Headgear 4 1954 SP38
TP13988 Hospital Water Tank North 4 1950 SU31
TP22064 Long Sutton Water Tank 2 1938 TF71
TP21244 Petters Tower 4 1962 SU31
TP18826 Rainworth Water Tank 4 1955 SK56
TP12540 South Water Tower 4 1954 SU31
TP15099 Waltham Water Tank 3 1950 TA30
TP22799 Witchford Water Tank 3 1961 TL49
TP23798 Wraysbury Ballast Hopper 4 1959 TQ08
TP15116 Cargate No 2 Reservoir 4 1955 SU77
TP9465 Greenbank Church Tower 3 1989 NS77
TP13687 Sandal Castle 13 1989 SE22
TP15115 Sandyhills High Flats 13 1988 NS77

12 of the marks are recorded as destroyed. The exceptions are: Cargate No 2 Reservoir, Greenbank Church Tower, Sandal Castle and Sandyhills High Flats. The status for these is unknown.

As yet, no holes have been photographed. In appearance holes are likely to resemble a punch mark.


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