Out & About …

… on the North York Moors, or wherever I happen to be.

Codhill Quarry—A 19th-Century Legacy

Here on Codhill, on Gisborough Moors, is one of a pair of small sandstone quarries. Probably 19th-century1NYM NP HER Nos: 5416/5434.. It couldn’t have produced any significant amount of rock, likely used for some dry stone walling over at Sleddale Farm. Really, there is not much else to say about this feature.

Now, the day started off all hot and muggy, with yesterday’s morning mist nowhere in sight. But there was this thin blanket of high-level clouds that made the sun hazy. And that glorious heather bloom of the last few weeks? Well, now it’s past its prime.

And take a look at the moors stretching out into the distance. Percy Rigg, Ingleby Moor, Urra Moor. You’ve probably laid eyes on similar views a thousand times without giving them a second thought. Notice the closest hill looks darker than the one sitting behind it, and that one is lighter still, all the way to the horizon. What’s causing this effect? Well, it’s due to atmospheric optical scattering, an effect named after the British scientist Lord Rayleigh2‘Rayleigh Scattering’, Wikipedia<https://en.wikipedia.org/wiki/Rayleigh_scattering> [accessed 7 September 2023]. It’s far too complicated to explain here, but it also explains why the sky’s blue and the horizon’s always a shade whiter, even on a day when the sky is cloudless.



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One response to “Codhill Quarry—A 19th-Century Legacy”

  1. Martin Smith avatar

    My family on my mother’s side had Highcliffe Farm = humphreys =which they took over in 1945….I was born at 14 hutton village as was my sister & brother.
    Codhill farm is its real name…& if you walk up the kildale rd path from the village, bolden venture is on your left, but now the sense of the past has gone due to the cycle paths through the area…jet mines are here too…a sgtrange place to sit…you often think you are being watched!

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