| Title | Miscellaneous notes, calculation and diagrams, including:
Gwalia Colliery shaft details
Mynydd Newydd seams
Depths of seams in Swansea neighbourhood
Diagram of beam winding engine at Pentre Colliery
Diagram of beam winding engine with double cylinder engine at Mynydd Newydd Pit
Gorwydd New Pit strata
Notes from 'Grandfathers field book' |