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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.
5
  S-prefix
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.
S0950
S8628
  G-prefix
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.
G3646
  L-prefix
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).
11328
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
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2017

September 2017
Plymouth, Boons Place
Plymouth, 232 North Road West
Plymouth, North Road Railway Bridge
Plymouth, St Dunstan's Abbey School
Plymouth, North Road West
Plymouth, 246 Cecil Street
Plymouth, Noah's Ark Childcare Centre
Plymouth, Duke of Somerset
Plymouth, St Peter's Church
Plymouth, 11 Wyndham Street West
Plymouth, Notre Dame Convent High School
Plymouth, 119-120 King Street
Plymouth, 12-14 Octagon Street
June 2017
Bath, Royal Avenue, East Gates
Bath, 2 Gay Street
Bath, 27 Queen Square
Bath, 20 Queen Square
Bath, 13 Queen Square
Bath, 10 New King Street
Bath, 17 Charles Street
Bath, The Trinity
Bath, Westgate Buildings
Nottingham, Platform One Practice, Station Street
Nottingham, Station Street opp. Waterfront House
Nottingham, Seven Arches Bridge
Nottingham, The Hicking Building, Queens Road
Cholsey, 59 Wallingford Road
G2612 - Ffestiniog, Tal-y-bont
S0436 - Bala, Old School
11443 - Ffestiniog, Pont Yr Afon Gam
May 2017
Edinburgh, 1 Elm Row
Edinburgh, 10 Blenheim Place
Edinburgh, Greenside Church
Edinburgh, Greenside Church Path
Edinburgh, Calton Hill Blocked Entrance
Edinburgh, Calton Hill Stone
Edinburgh, Hume Walk
Edinburgh, Calton Hill Garden Wall
S3006 - Calton Hill
Edinburgh, Nelson Monument
Edinburgh, National Monument of Scotland
Edinburgh, Calton Hill Path Junction
Edinburgh, Calton Hill Steps
Edinburgh, Regent Road / Hume Walk
Edinburgh, Waterloo Place
Edinburgh, 22 Hanover Street
Edinburgh, 12 Downie Terrace
Edinburgh, Corstorphine Hospital
Edinburgh, Pinkhill Station
Edinburgh, Glendevon Park Railway Bridge
Edinburgh, 1 Antigua Street
Edinburgh, The Cottage, West Princes Street Gardens
Edinburgh, West Princes Street Gardens
Edinburgh, The Mound
Edinburgh, The Mound / Mound Place
Edinburgh, 1 Mound Place
Edinburgh, North Bank Street
Edinburgh, Edinburgh Castle, Esplanade
Edinburgh, Castle Wynd North
Edinburgh, The Hub
Edinburgh, Johnston Terrace / Upper Bow
Edinburgh, Bedlam Theatre
Edinburgh, Greyfriars Kirk
Edinburgh, 27 Chambers Street
Edinburgh, Chambers Street
Edinburgh, 125 George Street
Edinburgh, 107 George Street
Edinburgh, 91 Hanover Street
Edinburgh, Queen Street / Queen Street Gardens East
Edinburgh, 7 Queen Street
Edinburgh, Regent Road opp. Regent Terrace
Cockenzie, 74 High Street
Cockenzie, 1 Edinburgh Road
Prestonpans, 17 High Street
Prestonpans, Winfields, East Loan
Edinburgh, 12 Gayfield Square
Edinburgh, 21 Leith Street
Edinburgh, Balmoral Hotel
Edinburgh, Princes Street opp. 60 Princes Street
Edinburgh, Princes Street opp. Tram Stop
Edinburgh, Princes Street opp. Frederick Street
Edinburgh, Princes Street opp. Castle Street
Edinburgh, King George IV Monument
Edinburgh, St Andrew's and St George's Church
Edinburgh, National Portrait Gallery
Edinburgh, St Paul's and St George's Church
Edinburgh, 24 Broughton Street
Edinburgh, 40 Broughton Street
Edinburgh, Broughton Place Church
Appleby, St Lawrence's Church
Appleby, Kingdom Hall
Appleby, Bongate House
Appleby, Bongate
Appleby, St Michael's Church
Appleby, Jubilee Bridge
Appleby, Scattergate
Appleby, 6 Colby Lane
Appleby, Shaws Wiend
Appleby, High Cross
Appleby, The Ings
Appleby, Banks Lane
Appleby, Chapel Street
Appleby, King George's Field
Appleby, Post Office
Appleby, Moot Hall
Appleby, Low Cross
1251 - Appleby, St Lawrence's Bridge
Appleby, Battlebarrow
Appleby, Belgravia
Appleby, Long Marton Road Bridge
Appleby, Barrowgarth Guest House
Appleby, Garthheads Road
Appleby, Station Road
Witton, Brookvale Road Canal Bridge
Walsall, Walsall Lock No 3
Walsall, Walsall Lock No 2
Willenhall, Bentley Wharf Bridge
Wolverhampton, Low Level Station (SE)
Wolverhampton, Low Level Station (NW)
Smethwick, Galton Valley Pumping Station
Saunderton, Station Railway Bridge
Oxford, 270 Marlborough Road
April 2017
Northend, The School House
Turville, St Mary's Church
Fingest, St Bartholomew's Church
Cadmore End, St Mary's Church
Cadmore End, Primary School
Piddington, Milestone, Wycombe 4
Radnage, Two Yews Cottage
Stokenchurch, St Peter and St Paul's Church
London, Christ Church, Spitalfields
Castle Rising, Castle Farm House
Castle Rising, 29 Lynn Road
Castle Rising, St Lawrence's Church
G4142 - Castle Rising, St Lawrence's Church
North Elmham, County School Station
Wymondham, Abbey Church
S2141 - Massingham
G3198 - Harpley, April Cottage
G2964 - Castle Acre, 32 Town Lane
Castle Acre, 26 High Street
Castle Acre, Primary School
Castle Acre, St James the Great Church
Castle Acre, Jubilee Bridge
Castle Acre, 65 Bailey Street
Castle Acre, 9 Bailey Street
G4144 - King's Lynn, Gaywood Bridge
King's Lynn, 56 High Street
King's Lynn, 26 High Street
King's Lynn, Union Lane
G4146 - King's Lynn, Post Office
King's Lynn, Greyfriars Tower
King's Lynn, Mill Fleet
King's Lynn, Stonegate Street
King's Lynn, The Maltings
King's Lynn, 30 Nelson Street
King's Lynn, 4 Nelson Street
King's Lynn, St Margaret's Church
King's Lynn, Town Hall
King's Lynn, Marriott's Warehouse
King's Lynn, College Lane
King's Lynn, Custom House
King's Lynn, 19 King Street
King's Lynn, Crown & Mitre
King's Lynn, 24 Tuesday Market Place
King's Lynn, Bishop's Lynn House
King's Lynn, St Nicholas' Chapel
King's Lynn, Red Mount Chapel
G4145 - King's Lynn, St John's Church
King's Lynn, Lynn Museum
King's Lynn, 16 Tower Street
King's Lynn, Railway Station
Hunstanton, St Edmund's Church
Hunstanton, Greevegate
Hunstanton, Golden Lion Hotel
Hunstanton, Boston Square
Hunstanton, Bowling Green
Hunstanton, Rhianva Court
Hunstanton, 1 Clarence Road
Salisbury, Dews Road Factory
Salisbury, 40 New Canal
Salisbury, Guildhall
Salisbury, White Hart Hotel
Salisbury, St Anne's Gate
Salisbury, 10 North Walk
Salisbury, 21 North Walk
Salisbury, King's House
Salisbury, North Canonry
Salisbury, Mompesson House
Salisbury, North Gate
Salisbury, St Mary's Chambers
Salisbury, 35 High Street
Salisbury, St Thomas's Church
Salisbury, City Library & Art Gallery
Salisbury, Fisherton Bridge
Salisbury, Summerlock Bridge
Salisbury, 138 Fisherton Street
Salisbury, St Paul's Church
61 - Salisbury, Fisherton Street Railway Bridge
Salisbury, Railway Station
Westminster, Opposite 28 Boston Place
Westminster, Opposite 8-10 Boston Place
March 2017
Oxford, 135 Marlborough Road
Oxford, Christchurch Meadow Sluice
Oxford, St Matthew's Church
February 2017
Oxford, 75 Sunningwell Road
Oxford, New Hinksey Primary School
Oxford, St John's Church
Oxford, Hinksey Lake
Hinksey Halt Footbridge
Oxford, Lake Street Community Centre
S1652 - Barton Stacey
Swindon, Great Western Railway Works
Swindon, National Monuments Record Office #2
Swindon, National Monuments Record Office #3
Swindon, National Monuments Record Office #1
Swindon, National Monuments Record Office
Swindon, Government Offices
Twyford, Twyford Overbridge
York, Museum Gardens Entrance
York, York Minster (Deep)
York, Station Avenue
York, York Railway Station
York, The Royal York Hotel
York, Lendal Bridge
York, Lendal Tower
York, 2 Bootham
York, Dean's Park (Deep)
York, St Michael le Belfrey
York, 68 Low Petergate
York, 50 Goodramgate
York, 27 Goodramgate
York, 20 Ogleforth
York, 5 Minster Yard
York, 10 Minster Yard
York, The Lodge, Precentor's Court
York, York Minster
2423 - York, High Petergate
York, Duncombe Place
York, Lendal/Museum Street
York, The Yorkshire Museum
South Hinksey, Hinskey Stream Footbridge
Oxford, Devil's Backbone Bridge
January 2017
Abingdon, 37 West St Helen Street
Naunton, Foxhill
Chipping Campden, St Catharine's Church
1761 - Chipping Campden, Sheep Street
Chipping Campden, High Street
1760 - Chipping Campden, Wixey House
Chipping Campden, St James' Church
1759 - Chipping Campden, The Corner House
Chipping Campden, Wold's End
Chipping Campden, Market Hall
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Explanation of Types
Flush Bracket(188)
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