Penrhyn Slate Quarries Supplemental Ledger 31 December 1884 This includes the above ledger produced by Turquand Yongs & Co, Accountants, London. The ledger is indexed and an example of the departments included in the accounts are: expenditure, produce of the quarry, balance sheet, bills, cash book account, capital account, coals sold account, coal yard, freight, income tax and insurance. 31 December 1883- 31 December 1884.