One Book or One Wapentac Map’n’Lite to be won over the Easter Holiday. Competition closes Sunday midnight. Email your answers to email@example.com
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All triangulation pillars, points and benchmarks appear on or near the walks in Dark Peak Walks published by Cicerone Press and available HERE
Identify each Ordnance Survey triangulation pillar or triangulation point. Name of triangulation pillar and grid reference required. Also which one is the odd one out. Wins a Wapentac Map’n’lite of Froggatt Edge
Alphin Pike Triangulation Pillar
Ordnance Survey Triangulation Points and Triangulation Pillars
Identify location of each Ordnance Survey benchmark or survey mark . Grid reference would be superb. Wins a signed gift wrapped copy of Dark Peak Walks. Closest answers will win.
One of the toughest ascents in the Peak District can be found just by Ladybower Reservoir in the Dark Peak area of the Peak District National Park.
Parkin Clough leads up to Win Hill, a total ascent of some 300m in little over one Kilometer. The path, such that it is, is the old boundary wall running up the side of the stream which tumbles down the hillside. Parkin Clough is a narrow V shaped gorge cut by the stream, with steep sides, you would not want to slip down. It is very slippery under foot in wet weather as you are walking along what remains of the wall, with some high stepping required in places to get the thighs and calfs burning.
The climb up Parkin Clough is something of a test piece for fitness, the test being to make it to the top in the shortest time, the quickest I have heard of is 12 minutes unladen and a little over 15 minutes with full hill kit. The test for lesser mortals is to make it to the top without stopping. Ascending to the summit begins at the foot of Parkin Clough by the Peak and Northern Footpath Society signpost and ends when the hand touches the thoughtfully placed triangulation pillar on the top of Win Hill. The views across to the Upper Derwent Valley and along the skyline to Kinder Scout and Bleaklow make the effort worthwhile.
In the 1700’s the first baseline for triangulation was measure on Hounslow Heath. It first used wooden then iron and finally glass rods for better accuracy to measure the baseline of the first triangle. Subsequent triangulations formed new baselines, then in 1936 a whole new system of triangulation was developed by Ordnance Survey along with a whole new set of markers on the ground for the triangulation points.
The last triangulation of Britain took place between 1935 and 1962 with the now familiar triangulation pillar being used for the first time. Along with the pillars there were several other types of markers employed for the survey points.
Buildings were often used, especially ones which would not probably be pulled down in the future, churches were a favourite, Bakewell was one, as was the Hunting Tower and its flagstaff on the Chatsworth estate.
Fundamental Benchmarks were the cornerstone of the whole system, these were protected by iron fencing. The FBM as they were known were seated on bedrock and were used as definitive levelling points as the one on the Mortimer Road on Broomhead Moor.
Surface Blocks like the one at Hollingworth Head, there is also one near Big Moor formed part of the triangulation measurements. They lie close to the surface but are hard to find as they are often covered with grass. Even harder to find are Surface Bolts such as the Laddow Rocks one. It is amazing that a small bolt has survived all this time.
And sometimes a triangulation point just isn’t one. This is the case of the Hey Edge Pillar which is marked on the map as a Pillar, but does not have the blue triangle on the map. That is because whilst it was built it was never used for triangulation. It was used for levelling, but as I have said that is a totally different set of measurements. Hence it does not qualify as a trig point to Ordnance Survey.
Nowadays with GPS triangulation by hand is no longer required and the Ordnance Survey network of triangulation points is falling in to disuse, apart from a few that is. The Triangulation Pillar at Harland South forms part of the Global Positioning System network, as does the Fundamental Benchmark on Broomhead Moor. So even though GPS is now the dominant measuring system for position, it still relies on spots on the ground for accuracy.
Yesterday was a Ranger Patrol day. The first duty was to marshall road traffic whilst the Remembrance Day service was being conducted at the Derwent Village War Memorial. It always stirs something when I hear the bugle reaching out across the valley to the sunken village below Derwent Reservoir.
After with a trainee Ranger we walked up to Hagg Guide Post for a spot of lunch, whilst we looked out over the Woodlands Valley up into Blackden Clough. No matter what perspective you look from, Kinder Scout always has something to offer. We sat and traced the old routes, from Hope Cross some say a Roman Road, the shooting track up to Jubilee Lodge, the best shooting lodge in the area and always locked. The aqueduct path following the course of the water stolen from the River Ashop and poured into Derwent Reservoir just by the dam. We could see the line of Jaggers Clough where, sitting above and a little up in to the Vale of Edale sits a small cairn that used to be named on the 1850 maps as the site of an altar.
Below us lay the Snake Road, and between us a landscape not often explored. The track going down passing by Hagg Farm and across to Haggwater Bridge on the River Ashop. Another track leading down to Rowlee Farm, one of the oldest and passing Bellhagg Barn on the way, with the Alphabet Stone opposite, a favourite for navigation assessments. Hagg is an old word meaning clearing, where the farms were situated in forest clearings.
We left our lunch spot and ascended to Bellhagg Tor, on our way walking by a bronze age barrow, letting sleeping ancients lie. Then on to Pasture Tor, moorland taking over now, opening up, below us and ahead Alport Dale gradually coming into view, the scene of the worst of tragedies when young lives were lost and still today the scene of many a find of a lost walker as they take the wrong turn off the Pennine Way coming down from Bleaklow Head. An easy thing to do when conversation or visibility take the mind away from the path.
As we walked along the Dale edge the wind picked up a little, but amazingly still quite warm for November. We meet a large group from Lockerbrook and I regale them with tales of the Love Feast at Alport Hamlet and one of the Dark Peaks great daughters Hannah Mitchell who escaped cruelty from that Hamlet and her mother to rise in prominence in Manchester and become a light in the Suffragette movement. On we go, the ground becoming wetter after the recent snow and rain. We can just see the West End triangulation pillar gleaming in the sporadic beams of sunlight.
At Ditch Clough we turn into the moor and begin our descent. The shooting cabin has now returned and I show my companion. We sit inside and feel the warmth and I tell him of bringing a young couple and baby in there to warm up, one harsh winter ago. Ill dressed for the terrain and the weather, the baby struggling in the conditions, the father holding it inside his coat, looking frightened. Then out and past the grouse butts and through the gate into the forest. I noticed the wall, with crenellations and marvel at the neatness, even after all these years, the wall being at least one hundred years old.
They laid a new track up Ditch Clough, to get the landy’s up there with their expensive cargoes of shooters. It makes for a nice descent down in to Westend coming out on the track nearby the remains of Westend Farm, now long gone.
I like collecting things. Triangulation points are a favourite along with benchmarks that can be found along a walk or near to one.
There is something very satisfying about reaching a trig pillar, partly I guess because they invariably involve a walk up hill and a reward of sweeping views, weather permitting. There are 84 pillars within the Peak District National Park boundary and many more triangulation points and thousands more benchmarks.
Some are not shown on maps with the traditional blue triangle, the one at Hey Edge for instance, built but never used for triangulation, but was used for levelling, so does it not qualify for the blue triangle.
Some triangulation points are not even pillars. One of my walks takes in the Hunting Tower on the Chatsworth Estate, the triangulation point being the flagstaff. Another is the centre of the spire of All Saints Church in Bakewell.
With the advent of GPS the triangulation pillar network became largely redundant, but a few still do have a purpose. The pillar at Harland South, levelling bracket number 2998 is part of the Global Positioning Network and as such is protected by Ordnance Survey. A plate informs the visitor that any damage should be reported to the phone number.
Triangulation points always come in a minimum of three so a favoured walk of mine takes in the Hunting Tower at Chatsworth, the pillar at Birchen Edge along with the Three Ships and the pillar at Harland South, passing Hobs House, one of the first ancient monuments to have legal protection in the UK, on the way. Two pillars, one part of the Global Positioning System and one flagstaff on a hunting tower. Not bad for a day out.