what is interesting about this building is the very high quality of the plastering and the materials used.
The corners are bevelled and run in a harder material than the walls. The internal walls are rendered in cement finished very flat and then skimmed with lime about 2mm thick. The corners were run separately and left a little edge for the final skim coat to finish seamlessly on the corners. The plastering is interesting because it must have been done at a point in history when cement was being used but modern gypsum plasters had not. The window frames are oak, the vents are aluminium.
By chance, yesterday I was talking with someone who mentioned a man he knew who was involved in extracting gypsum by using large diameter coring drills, so that the gyspusm remained a hard solid, rather than as fine material or powder. Would it have been used in its solid state for anything? I have always thought of it being quarried and immediately crushed.
Also yesterday I had a personal underground tour of the Park Lane Bath stone mine at Neston, near Corsham, in Wiltshire. As the manager and I walked through the workings, we came across fragments of the original mine railway: a length of rail, rotted sleepers and rail spikes. Several old headings had been backfilled with rocks in the days when the work was still very much all by hand. In total contrast to the modern stone cutting and transport machinery in use now. I talked with one of the workers who explores the old Bath stone mines and quarries in the area.
At Moonraker stone cutting works in Corsham, I chatted with a workman who, with mates, illicitly explores many of the old underground sites in the area.