We crossed an electric power cable in the middle of the track up to Red Tarn.
It came from the ruins of a concrete building that is at the bottom of what is marked on the map as a pipeline.
Further up the path, the map shows a leat. I realised that this could be seen as a horizontal line across the fellside and ended exactly at the top of the pipeline. We had found the remains of the first hydroelectric power station for Greenside Lead Mine. The scale of the leat is extraordinary. It starts in Kepple Cove and crosses a good mile of fellside. The whole thing is now a historic monument.
According to Wikipedia, it started out as a DC generator but it was twenty years before they installed a modern AC generator that would allow transformers to be used. This may be because the only motors available at the start of electrical engineering were DC.
