| Disgrifiad | This bundle contains various reports relating to the draining, working of the lower depths of the quarries, extension of the lower quarries, the quality of the unworked slate and comparisons of sales of slate for the months between 1804- 1841. There are also 6 letters included in this bundle that relate to the above reports, the sizes of slates are also discussed and orders of slates.There's also a receipt included for work carried out, and a Plan of the Penrhyn Slate Quarry. The documents included are the following, ‘Conditions and Specification for the Sinking of Shafts and Driving Drifts, at Penrhyn Slate Quarries’, and, ‘Translation of an Office Copy of a Record in the Public Record Office intitled ‘Patent Roll 12 James I Part 18. No. 6’. |