Final Preparations Glen Mhor 1894
This particular invoice (a beautiful one at that) was found in a bunch of documents, all for Glen Mhor (it is also noted to Inverness) and it's an order from Glenboig Union Fire Clay, Glasgow, and is signed by none other than Charles C. Doig.
The Glasgow firm was the maker of bricks, pipes and other materials required for building. The invoice does include pipes amongst other things and a previous order from 23rd April 1894.
This period is when Glen Mhor was coming online and producing its new make spirit. It would make sense that Charles was onsite or visiting frequently to see the final preparations.