Benchmark, Bronze Age, Cairn, Dark Peak, Graffiti, Grindstone, Gritstone, Hathersage, Hathersage Moor, Higger Tor, Landscape, Ordnance Survey, Peak District, Peak District National Park, Triangulation, Triangulation Point
Yesterday I spent a few hours on Hathersage Moor and Higger Tor seeing if any benchmarks shown on old maps would still be evident today.
The image from the old map above is taken from a survey of the Moor carried out in 1852. Would the benchmarks shown still be there, did they actually exist or were they just markings on the map showing where a measurement had been taken from? What did they actually look like?
The one on Higger Tor, (Higher Tor), seemed to be the easiest to find. It’s the small arrow between the ‘r’ and ‘T’ of ‘Higger Tor’. The marking is not to scale obviously, nearby there is a triangle denting a triangulation point. It also has lots of features to aim from and sure enough that’s how it turned out. It took a while of rummaging around and at first I was looking for a benchmark on a vertical surface and chiselled in the style that is normally seen on buildings and gate posts. Then I found it, on a large flat stone, in the middle of the edge path. The marking was on a horizontal surface and pointed west, not north as in the map. It was a simple arrow with no levelling line at the tip of the arrow. The mark was still very clear, although if you weren’t looking for it you probably wouldn’t notice it. Did they take the measurement and then make the mark or vice versa? A Benchmark denoted a levelling point, hence the number, in feet, nearby, and the triangle marked the spot for triangulation. Are they one and the same place or was the triangulation in a different spot. Close by there was a spot that would have been perfect for a tripod and theodolite.
Dropping down from the Tor onto the Moor I set out to find the other two marks that are shown on the map as you head south-west towards the walled enclosure. Success was not to be mine. I needed to do a great deal more work on the position of the marks. The bracken hid many boulders and time had allowed moss and lichen to grow over a large number. I didn’t want to disturb too much so looked but could not find the two.
I did find other items of interest though. A possible burial cairn, complete with chamber. A partially finished grindstone, some way from the traditional grindstone fields and more markings that were different to the Ordnance Survey marks.
A few hours spent walking in the foot steps of surveyors and masons and perhaps Bronze Age man.