| Description | On the same sheet: Memorandum. Comparison of coal consumption at Consolidated Mines by 7 “old fire engines” 1 Jul. 1778—1 Jul. 1779 and 5 Boulton & Watt engines 1 Jul. 1783—1 Jul. 1784. Docketed “With comparative view of new and old engines. Mr. Kevill’s application for the removal of Wheal Gons engine.” |