| Description | Docketed “Abstract of Richards’ boiler making account from Christmas 1830 to Jul. 1836. Average cost of making boat boilers: 1820 to 1824 £8.8.2 per ton; 1824 to 1830 £8.13.2 per ton; 1830 to 1836 £9.12.4 per ton. Means of accounting for the increased cost.” |