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Explanation of Types

Type Description Examples
Flush Bracket These are rectangular metal plates affixed to triangulation pillars, walls, buildings etc. If they are not affixed to a triangulation pillar they are often referred to as Non-Pillar Flush Brackets (NPFB). They are about 6" x 3" in size and the location of most of them is known through Ordnance Survey (OS) records. Each Flush Bracket (FB) has a unique serial number which makes them highly 'collectable' and there are several numbering types.  
  One to four figure number
The earliest FBs you can find and date from 1912-1921. Numbered from 1-3000. A few can be found on triangulation pillars.
Introduced in the 1920s these are found on pillars and as NPFBs. There are two sub-types, S below the number and S left of the number.
First appeared in 1936. Unlike S-series brackets numbers below 1000 do not have leading zeroes. Used extensively in Scotland and never found on triangulation pillars.
Just sixteen brackets used in London in the early 1930s.
  Five figure number
These are effectively S-series brackets above S9999 where they ran out of room for the S (S-below was discontinued as the S interfered with the measuring equipment).
Projecting Bracket An early type of metal bracket used for a short time before the introduction of flush brackets. They are all the same and have no unique attributes. Reading, Greyfriar's Church
OSBM Bolt Used alongside the G-series of flush brackets these are placed where there wasn't a convenient building or wall to provide a vertical surface on which to affix a flush bracket. They are domed metal bolts about 1" (50-60mm) in diameter fixed to horizontal surfaces engraved with OSBM and the benchmark symbol. Caban Coch Dam
Cut Bench Mark By far the most common type. Used and made from the 1800s to around 20 years ago. You won't have to walk (or drive) very far in any village, town or city in Britain before you spot one of these. Chiseled into stone, brick or wood on all sorts of vertical structures. A familiar horizontal levelling line with a three line arrow pointing towards it (usually upwards). Each one is unique depending on the mason who cut it, some are plain, some decorated. Some roughly cut, some exquisitely cut with high accuracy. Some small, some huge. Wallingford, 60 High Street
Cut Bench Mark with Bolt Old and rare these have a metal bolt screwed either alongside the horizontal cut of a cut bench mark or at the point of the cut arrowhead. Usually has what appears as a screwhead horizontal in the head of the bolt. These are highly prized by benchmarkers. Dorchester Abbey
Rivet Usually found on horizontal surfaces these are cut marks with a small metal domed brass rivet at the apex of the cut arrowhead marks. Swyncombe, Icknield Field
Pivot Fairly rare these are used on horizontal surfaces such as soft sandstone, where the insertion of a rivet would break away the stone. They consist of a small hole or depression cut to take a pivot, a steel ball bearing of 5/8" diameter (16mm). In use, the pivot is placed in the depression and the levelling staff held on top of the pivot. Sutton Bridge
Fundamental Bench Mark These are the key to the whole levelling of the UK. Granite blocks with large domed metal caps. Just like an iceberg this is just the tip of a fairly extensive underground structure. Highly accurate height stations still used today as the baseline to levelling. Conwy
Triangulation Pillar Familiar to anyone who walks in the British countryside, these can often (but not always) be found at hilltops. Most have a flush bracket affixed to one side. Huntingland


August 2023
Cut Bench MarkFence, Noggarth Road
Cut Bench MarkNewchurch-in-Pendle, 33 Newchurch Village
Cut Bench MarkNewchurch-in-Pendle, St Mary's Church
Cut Bench MarkNewchurch-in-Pendle, Glebe Barn
Cut Bench MarkBarley, Methodist Church
Cut Bench MarkBarley, Barley New Road Bridge
Cut Bench MarkBarley, Barley Bridge
PivotBarrowford, Pendle Water Wall
Cut Bench MarkBarrowford, Barrowford Bridge, West End
Cut Bench Mark with BoltBarrowford, Barrowford Bridge
UnknownHeptonstall, Clough Hole Bridge
Cut Bench MarkHeptonstall, Clough End Farm
Cut Bench MarkHebden Bridge, Hebble End
Cut Bench MarkHebden Bridge, Rochdale Canal Towpath
Cut Bench MarkHebden Bridge, 23 Market Street
Cut Bench MarkHebden Bridge, White Lion Hotel
Cut Bench MarkHebden Bridge, Rockville, Birchcliffe Road
Cut Bench MarkHebden Bridge, Stubbings Infant and Nursery School
Cut Bench MarkHebden Bridge, 6 Hollins Crescent
Cut Bench MarkHebden Bridge, Stubbing Footpath
Cut Bench MarkHebden Bridge, 2 Commercial Street
Cut Bench MarkHebden Bridge, 3 Carlton Street
Cut Bench MarkHebden Bridge, Crown Inn
Cut Bench MarkHebden Bridge, 18 New Road
Cut Bench MarkHebden Bridge, Black Pit Aqueduct
Cut Bench MarkHebden Bridge, Hebble End Bridge
Cut Bench MarkHebden Bridge, Palace House Road Railway Bridge
Cut Bench MarkHebden Bridge, Black Pit Bridge
Cut Bench MarkHebden Bridge, West End Bridge
Cut Bench MarkHebden Bridge, 2 Crown Street
Flush Bracket856 - Hebden Bridge, White Lion Hotel
Cut Bench MarkClitheroe, 76 Whalley Road
Cut Bench MarkClitheroe, 18 St James Street
Cut Bench Mark with BoltWhalley, St Mary's & All Saints Church
Cut Bench MarkRibchester, 62 Church Street
Cut Bench MarkRibchester, 8 Blackburn Road
Cut Bench MarkRibchester, St Wilfrid's Church
DestroyedClitheroe, 42 Eshton Terrace
RivetClitheroe, Castle Wall
Cut Bench MarkClitheroe, National School
Cut Bench MarkClitheroe, Castle Grounds Entrance
Cut Bench MarkClitheroe, Castle Steward's House
Cut Bench MarkClitheroe, Castle Stables
Cut Bench MarkClitheroe, Castle Keep
Cut Bench MarkClitheroe, 1 Moor Lane
Cut Bench Mark with BoltClitheroe, 20 Parson Lane
Cut Bench MarkClitheroe, De Lacy Street
UnknownClitheroe, Edisford Road Substation
Cut Bench MarkClitheroe, Edisford Primary School
Cut Bench MarkClitheroe, St Paul's Church, Low Moor
UnknownClitheroe, Roefield Cottage
Cut Bench MarkClitheroe, Roefield Farm


All the bench marks I have logged. See my profile on the Bench Mark Database.

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Explanation of Types
Flush BracketFlush Bracket(247)
Projecting BracketProjecting Bracket(6)
OSBM BoltOSBM Bolt(16)
Cut Bench MarkCut Bench Mark(1987)
Cut Bench Mark with BoltCut Bench Mark with Bolt(134)
Fundamental BenchmarkFundamental Benchmark(8)
Triangulation PillarTriangulation Pillar(99)
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