Thanks christwigg for posting the Mining in Europe extract. Althgough I'd downloaded it from the Open Library I hadn't spotted that it had a description of Oakeley in it!
Even more interesting is this photo in the extract, of the Water Balance incline, the G Trwnc, lifting from G floor up to DE. It is a shame that the original scanning seems optimised for text and diagrams, but struggles with the photographic illustrations at times.
The drumhouse in the background is the F Trwnc -also known as y Trwnc Ddu - which lifted from F floor up to DE.
Photograph:
🔗Oakeley-Slate-Mine-Archive-Album-Image-51875[linkphoto]Oakeley-Slate-Mine-Archive-Album-Image-51875[/linkphoto][/link]
The map is the territory - especially in chain scale.