Just came across this while rootling though a 1940s book on mine timbering
Oak- Pit wagon underframes, soles, splendons, buffers, also as lagging for haulage and winding drums.
Ash- Lockers and sprags for pit wagons, brake sticks, shot hole stemming rods, and pony shafts or limmers.
Elm- Sump timbers, wagon controllers and squeezers, wagon boards, underground ventilation doors and frames, but the last named are usually preferred in soft wood.
Poplar- Brake blocks and tram boards.
Softwood including Pine, Larch, Fir etc Pit Wagon boards, ventilation doors, and frames, battens for covering underground haulage wheels etc.
Pitch Pine- Shaft guides, spear rods, sump baulks, and shaft timbers at the surface and landings or shaft insets, also headgear and wheel frames.
Maybe Pitch Pine should include 'bridge timbers'
There are 10 types of people in the world.
Those that understand binary and those that do not!