| Description | [Neither Watt nor Keir are sure about taking out a patent now. Mr Keir is setting up a works with Mr Blair but will be using cheap vitriolic salts. Asks if Black has made any experiments on the terra ponderosa. Mr Fabroni’s discovery of a cheap solvent of caoutchouc. Has sent a copying press via Manchester. Matthew Boulton is in Cornwall, concluding the Wheal Virgin business. He would like the process for making tartaric acid]. (Partners no. 71) |