"Rules to be observed in the working and Management of the Slate Quarry belonging to the Honble. Hugh Warburton and John Pennant, Esqr." No date, but after 1765; approximate date, 1770. Provision for sets or companies of 5,6,7, or more workmen; persons who apply for work but for whom there is no vacancy in the works at present open, must form a set or company to open the quarry in a new place; appointment of slate-reeve, a resucitation of Panter's idea in the years 1738 to 1744 to keep account of the slates delivered at Aber Cegin by each set or company of workmen; the reeve's accounts to be presented to the agent of the estate four times yearly (25, 24 June, 29 Sept., and 25 December). c.1770