| Description | Wanted to secure Matthew Boulton an authentic account of a typical Cornish engine. Matthew Boulton sent him details of the new engine but did not say in what time it did the work described. Details of the performance of an engine working a copper mine. If Matthew Boulton’s is superior, he might pursue his scheme in Cornwall profitably. Description of the use of engines at Cornish copper mines. Details of coal prices. There is a new sort of pewter being made but it is not well thought of. The price of tin is rising. Boulton has used the sheet for calculations. |