Industrial relics – seems these were built to process limestone, built by prisoners of war and owned by a company called Partington Steel and Iron Co. Early twentieth century.
They now sit on pasture land grazed by sheep. They may never have been used, though there is evidence of the railway line close by and tipping docks.
The sketch above was done, quite quickly, on the spot with graphite block. A little tweaking later, but not much.
I sketched the second one in outline on the scene, but did a lot of work on it later, using the photograph as a reference. I may well tweak further.