TRIG POINTS

 

 

Trig points or to give them their correct name triangulation pillars were constructed by the Ordnance Survey when they re-triangulated the original surveys of the country in 1933. They were added to over the years, but now the majority are no longer used with modern arial photgraphy and satellite imaging used for map making.

 

 

 trig-diagram

 

 Diagramatic representation of a trig column.

 

 

 

top of a Trig point showing the brass mountings for the theodolite. top-os-column-lingfell

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

plate-os-column-ling-fell

 

 

Flush brackets on side of trig point. Each Trig pillar has the flush bracket illustrated if it is still present. Flush brackets were afixed to other structures to allow further leveling.  For these flush brackets follow link

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PLATEHIGHSTTRIGPOINT

 

A plate on the trig point on High Street, Cumbria showing this trig point is still used.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Not all pillars were put up by the Ordnance survey, in areas around the coast very similar pillars can be found that were put up by the Admiralty. Usually shown on maps as Hydrographic survey pillar.

 

lochewe-admiralty-pillar

 

 

An Admiralty pillar at Loch Ewe Scotland NG 815 919.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

admiralty-pillar-top

 

 

Plate on top of pillar.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

pillars and other structures have been errected in the countryside to allow surveying to take place usually for major engineering projects

 

pillar-artlecrag   

 

Structure on Artle Crag (NY 484 103) built for the construction of the Haweswater Reservoir.

harrop pike cairn

A second pillar on Tarn Crag NY 48752 07800.

 

 

 

Cumbrian Pennine and Howgill Trig points.

Lakeland Trig Points

North Pennine Trig Points

Other Cumbrian Trig Points

Southern Scotland Trig Points

  

Central Scotland Trig points

HIGHLAND SCOTLAND TRIG POINTS

CUMBRIAN PENNINE TRIG POINTS

Black Fell

 

 

 

BLOTTING RAISE

Burnhope seat

CROSS FELL

Fiend Fell

 

 

Grey Nag.

Middle Fell

 

Thackmoor.

The Calf 

BURNHOPE SEAT.  NY 787 375

 

 

trig-point-burnhope-seat

 

High on the north Pennines this colun is on the Cumbrian - Durham border. Height 747m.

 

FIEND FELL. NY 642 406

 

OS TRIG POINT FIEND FELL

 

The small summit just to the south of Hartside cafe. Height 634m.

 

BLACK FELL. NY 648 444.

 

TRIG-POINT-BLACK-FELL

 

 The top to the north of Hartside cafe. Height 664m. 

 

THACKMOOR  NY 611 462

 

Englands newest mountain a recent survey has shown this to be over 2000 ft. It was surveyed at 609.62 m. 2 cm over the metric equivalent of 2,000 ft.

 

 thackmorr-trig

THE CALF HOWGILLS SD 667 970

 

trig-the-calf

 

 Height 676 m.

 

flush-calf-trig

 

Flush Bracket on the calf.

 

 

crossfell-trig

 

 

CROSS FELL NY 343 893

 

 

Height 893m the highest point  in England outside the Lake District.

 

crossfell-fluah

 

Flush bracket on trig point.

 

middle-fell-trig 

 

 

MIDDLE FELL TRIG NY 749 441 HEIGHT 575.

 

middle-fell-trig-flush

 

Flush bracket on trig.

 

 

BLOTTING RAISE NY 597 496

 

blaise-riggtrig

 

 

Height 591m.

 

blotting-riggplate

 

Flush bracket.

 

GREY NAG. NY 665 476.

 

greynagtrig

 

Height 656m

 

greynagflush 

 

HARD RIGG. NY 74987 48760. On the Cumbria Northumberland border

 

hard rigg trig

hard trig flush

 

Height 546m.

 

 

 

 

 

NORTH PENNINE TRIG POINTS

 

coldberrytrig

 

 

HARDBERRY HILL NY 931 289

 

HEIGHT 529M.

 

 

 

LAKELAND TRIG POINTS

 

ARTLE CRAG PIKE.

 

BLENCATHRA

 

BURNT KNOTT

 

CRAG HILL

 

CLEUGH HEAD.

 

CONISTON OLD MAN

 GOWBARROW FELL

GREAT BORNE FELL

GREYRIGG FOREST

HIGH PIKE

 

HIGH RAISE

 

HIGH STREET

 LANKRIGG

LITTLE MEL FELL

LOADPOT HILL

 

LING FELL

 PLACE FELL

RED SCREES

 

SEAT ROBERT

 

SEATALLAN

SKIDDAW

WHITFELL

 

DSCF3788

 

 

 HIGH PIKE NY 318 350

 

above Caldbeck. The top now has aview indicator on it At a height of 658m.

 

 

 

trig-point-seat-robert

 

 

SEAT ROBERT NY 526 114

 


A variation on the Trig point this one is a concrete pad at ground level.

 

os-column-lingfell

 

LING FELL NY 180 286

 

 

Height 373m.

 

HIGHSTTRIG

 

 

HIGH STREET NY 440 110

 

Height 828m. 

 

FLUSHBRACKETHIGHST

 

Flush bracket on trig point.

 

blencathratrig

 

 

BLENCATHRA (SADDLEBACK) NY 323 277.

  

HEIGHT 868 M.

 

high-riase-trig

 

HIGH RAISE NY 280 095

 

 

height 762m.

 

flush-bracket-high-raise

 

Flush Bracket on Trig  point.

  

 

seatallon-trig

 

 

SEATALLAN NY 140 830

 

Height 692m.

 

seatallon-flush

 

 

Flush plate on trig point

 

whitfell-trig

 

 

WHITFELL SD 159 930.

 

Height 572m

 

whitfell-trig-flush

 

Flush bracket.

 

os-point-artlecragpike

 

 

 

 

 

 

 

 

 

 

 

 

 

 OS TRIG ON ARTLECRAG PIKE (BRANSTREE) NY 478 100.

 

red-screes-trig

 

 

 

OS TRIG POINT RED SCREES NY 396 087 HEIGHT 776M

 

red-screes-trig-flash

 

 

Flush plate.

 

loadpothill2

 

LOADPOT HILL NY 457 181 HEIGHT 671m.

 

loadpothilflush

 

Flush Bracket.

 

burnt-knott-trig 

 

BURNT KNOTT  NY 484 006. HEIGHT 427M.

 

 

 

burnt-knot-trig-flush

 

 

Flush bracket.

 

cleughheadtrig

 

CLOUGH HEAD TRIG POINT NY 334 225  HEIGHT 726M.

 

cleughheadtrigflush

 

 

Flush bracket on trig.

 

 

craghilltrig

 

 

CRAG HILL TRIG POINT NY 193 204 HEIGHT 839M.

 

This trig point built from stone from the summit has snapped and the top has become detached from its base (metal rods to left of column in photo) The flush bracket was missing. (January 2016)

 

CONISTON-TRIG 

 CONISTON OLD MAN SD 272 978. HEIGHT 803M.

 

 

 Flush bracket.

 

trig-point-lank-rigg

 

LANKRIGG TRIG PILLAR. NY 914 119 HEIGHT 541m. 

 

littlemeltrig

 

LITTLE MEL FELL TRIG POINT NY 423 240 HEIGHT 505m.

 

littlemelflush

 

Flush Bracket.

 

gowbarrowtrig

 

GOWBARROW FELL (AIREY CRAG) TRIG POINT NY 407 218 HEIGHT 481m.

 

gowbarrowtrigflush

 

Flush Bracket.

PLACEFELLTRIG

 

PLACE FELL TRIG POINT NY 4055  1697 HEIGHT 657M.

 

placefelltrigflush

 

Flush plates.

 gt borne trig

 GREAT BOURNE FELL NY 12384 16347  HEIGHT 616 M.

gt borne trig flush plate

 

Flush plate.

grayriggtrig

 

GRAYRIGG FOREST TRIG SD 599 998 HEIGHT 494M.

Since the enlargement of the lake District National Park in 2016 this hill by the side of the M6 is now in the Park.

 

grayriggtrigflush

Flush bracket.

 

skiddaw trig

Trig point on Skiddaw NY 26066 29075  height 931m.

 

skiddawtrigflush

 

Flush bracket.

 

OTHER CUMBRIAN TRIG POINTS

 ARNSIDE KNOTT

COAL PIT HILL

 

GLASSON

 

HUTTON ROOF CRAG

 

 

 glasson-trig

 

Glasson Trig Point  NY 259 609. height 17m. A trig point close to the Solway Coast mounted on a concrete pillar.

 

glasson-tripg-flush

 

Flush bracket on trig point

 

coalpithilltrig

 

COAL PIT HILL TRIG NY 592 109 height 401 m.

 

On top of the hill overlooking the M6 south of Shap summit.

 

 

coalpithilltrigflush

 

 

huttonroofcragtrig1

 

 

HUTTON ROOF CRAG SD 556 775 HEIGHT 274M,

 

 

huttonroofcragtrig2

 

 arnside knott

 Arnside Knott SD 45616 77470 height 159m.

 

arnside knott2

Flush bracket.

 

 

 

 

 

 

 

SOUTHERN SCOTLAND TRIG POINTS

 

ALMAGILL HILL

 

BENBRACK

 

BENCAIRN

 

BISHOP FOREST HILL

 

BLACK HILL

 

BROAD LAW

 

BENGRAY

 

DOLLAR LAW

 

GARELETT HILL

 

GREATMOOR

 

LITTLE QUEENSBURY.

 

RED KIRK POINT

 

SHALLOCH ON MINNOCH

 

THE CHEVIOT

 

WISPA HILL

 

WOODCOCK AIR.

 

trig-point-1st-arch

 

BENBRACK NX 870 970

 


This trig point is on the Southern Upland Way and lies next to one of Andy Goldsworthy's Striding Arches. Height 580m.

 

 garlethill-trig

 

GARELETT HILL NT 835 976

 

 

Height 680m

 

trig-point-black-hill-borde

 

BLACK HILL NT 58547 37002

 

 Height 317m.

 

thecheviottrig

 

 THE CHEVIOT NT 909 205

 

HEIGHT 815M  Tewchnically this is in England but very close to the border.

 

 trig-greatmoor

 

GREATMOOR NT 4897 0068 height 599m.

 

 

bishopforesthilltrig

 

 

BISHOP FOREST HILL  NX 849 796 Height 392m.

 

flushbracketbishopforesthil

 

Flush Bracket on trig point.

 

 

almagill-hill

 

 

ALMAGILL HILL NY 089 757. Height 217 m.

 

A small hill to the west of the river Annan and south of Lochmaben.

 

Although tis is a small hill it is full of interest. The Graham memorial is next to the treig point and there is two hill top forts (Moss Castle and Range Castle) further along the ridge. All easily accessible from the Annandale Way. 

 

 almagill-hill-flush-plate

 

Flush plate on Trig Point.

 

 

little-queensberry-trig

 

 

LITTLE QUEENSBERRY HILL NX 984 978.

 

Height 512m.

 

 broad-law-trig

 

BROAD LAW TRIG POINT  NT 147 235

 

Height 841m

 

Note part of the radio beacon station in the background.

 

 

dollar-law-trig 

 

 

DOLLAR LAW NT 178 278

 

 

Height 817m.

 

trig-shalloch-on-minnoch

 

 

TRIG ON SHALLOCH ON MINNOCH NX 404 907.

 

 

Height 768m.

 

 

redkirkpoint-trig

 

 

RED KIRK POINT. NY 302 650.

 

 

A low level Trig point on the edge of the Solway 8m above sea level. Global warming could soon remove this trig.

 

woodcock-air-trig 

 

 WOODCOCK AIR TRIG  POINT NY 170 722 HEIGHT 129M

 

 

Now totally surrounded by trees with no view.

 

woodcock-aie-flush

 

Flush bracket on column.

 

 

wispa-hill-trig 

 

 

 

WISPA HILL TRIG POINT NY 381 993 HEIGHT 595M.

 

wispa-trig-flush

 

 

Flush bracket on trig point.

 

 

bengraytrig1

 

 

BENGRAY TRIG POINT NX 631 598 HEIGHT 366.

 

bengreytrig2

 

Flush Bracket.

 

bencairntrig1

 

 

BENCAIRN TRIG POINT NX 770 545 HEIGHT 391M.

 

 

 

bencairntrig2

 

 

fLUSH BRACKET.

 

CENTRAL SCOTLAND TRIG POINTS

 

DUMYAT

 

EARLS SEAT

 

earls-seat-trig-point

 

EARLS SEAT NS 569 838.

 

Height 578m.

 

dumyat1

 

DUMYAT NS 835 976

 

Height 418 m.

 

 

HIGHLAND SCOTLAND TRIG POINTS

 

BEINN FHADA

 

BEINN FHIONNLAIDH

 

BEINN LORA

 

BEINN AN EOIN

 

BEN MACDUI

 

CREAG DHUBH

 

DEUCHARY HILL

 DUN DU GHAOITE

DUN I (IONA)

GEAL-CHARN MOR

 

RED POINT (GAIRLOCH)

 

SGURR AN AIRGID

 

macdui-trig

 

 TRIG ON BEN MACDUI. NN988 989. 

 

Britains second highest mountain at 1309m.

 

flush-ben-mac 

 

flush bracket on trig point.

 

geal-charn-trig

 

 

 TRIG ON GEAL-CHARN MOR NH 836 123.

 

Height 824 m.

 

flush-geal

 

Flush bracket on Trig point.

 

 

 

 

 

TRIG ON BEINN FHIONNLAIDH NN 095 498.

 

A Munro Height 959m.

 

summit-ben-loraJPG

 

 

BEINN LORA NM 919 377

 

 

height 308m. A small hilll overlooking Ardmucknish Bay north of Oban.

 

 

CREAG-DHUBH

 

Trig point on Creag Dhubh NN 322 825  height 658m.

 

beinn-an-eoin-trig

 

 

BEINN AN EOIN  NG 902 651. This concrete pillar has been destroyed with only the base remaining.

 

 

 red-point-trig

 

 Red Point Trig point.  NG 725 678 42m.

 

red-point-flush-plate

 

 

Flush Bracket Red Point Trig point.

 

ben-attow-trig 

 

 

Beinn Fhada (Ben Attow) NH 01857 19245 Height 1032m.

 

ben-attow-flush

 

Beinn fhada flush plate.

 

sgurranairtgidtrig

 

Sgurr an Airgid NG 94015 22698 Height 841m. This phot taken in July 2015 shows that this trig pillar is breaking up in the Scottish winters. It is a hollow concrete tube.

 

anairgidflush 

 

 Flush olate on Sgurr an Airgid trig.

 

deuchary-hill-trig

 

Deuchary Hill NO 037 485 Height 510m.

 

deuchary-flush

 

 

 Flush Bracket on Deuchary Hill

 

dun-i-iona 

 

DUN I (IONA)  TRIG PILLAR NM 284 252 HEIGHT 101m.

 

dun-dughaoite-trig

 

DUN DU GHAOITE (MULL) NM 678 354  HEIGHT 754m.

 

FLUSH BRACKETS AND BENCH MARKS

 

 

flash plate horse and jockey

Flush bracket on Rhudil House, Cumwhinton Number 1358, NY 448 525. Height 212.6800 feet [64.8249 metres] (1912 - 1922). Originally the house was the Horse and Jockey.  

 

 

flashplatebridge

Flush Bracket on railway bridge, Cumwhinton, number 1359, NY 4544 5309. 205.7230 feet [62.7044 metres] (1912 - 1922 leveling)

 

benchmarkwetheralrailwabrid

 

 

 

Flush Bracket on railway bridge, Wetheral, Number 3831, NY 4656 5472.

 

sandsbramptonflush 

 

Flush bracket on buiulding at The Sands Brampton. NY 535 611.

 

brampton police flush brack

Flush bracket on the Police station (magistrates Court) Brampton NY 52722 61061.

 

 flush-tebay-church

 

Flush Bracket on St. James Church, Tebay

 

applebybridgeflush

 

 

Flush bracket on the Eden Bridge at Appleby.

 

 hoddam-bridge-flush

HODDAM BRIDGE BRACKET.

 

ravenstonedaleflushbracket 

 

Flush bracket Ravenstonedale Church

 

BECH MARKS.

 

Below the flush bracket the Ordnance Survey provided a set of Bench Marks usually carved into a suitable stone. these consist of an arrow with a bar across the top. The majority are rather insignificant and can br easily overlooked.

The majority of Bench Marks are shown on large scale Ordnance Survey maps allong with their height above sea level.

benchmark-outside-grinsdale

 

 

A bench mark carved into a gate post in a field near Grinsdale.

 

benchmark-grinsdale

 A bench mark carved into a quoin on a barn at Grinsdale.

 

 

But occasionally they are embellished.

 

bench-mark-temple-sowerby-c

 

This bench mark is carved into a stone beside the door into Temple Sowerby Church. The height above sea level is very precise 348 feet 9 inches.