Punch mark

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A 'Punch Mark' is an uncommon type of 3rd or 4th order triangulation mark.

17 instances are recorded in the OSGB36 list [1]. Mark descriptions include "On vent", "On iron bolt" and "In Aluminium square". Locations include Water tanks, Reservoirs and Church towers. No Punch Mark has yet been found and no photographs exist.

10 of the marks are recorded as destroyed. The corresponding trig stations are:

Lint Brae,
Potters Wood Wtr Tank,
Druggon Hill Wtr Tank,
Peter Brotherhood Wtr Tank,
Rufforth Aero Wtr Tank,
Manvers Main Colly No 1 Headgear,
Ringstone Hill Resr,
Cleave Control Twr,
Stratton Resr,
Lincoln St Marys Ch Twr

A further 6 marks are deemed to be inaccessible. The corresponding trig stations are:

Sunlight House Aux,
Ringstone Hill Resr,
Guildford Cathedral,
Lincoln St Marys Ch Twr,
Irthlingborough Sec Mod School,
Peters Green Wtr Tank (1980),

The trig station corresponding to the remaining Punch Mark has not yet been visited:

Alpha Clay Plant


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