Lives of Boulton and Watt. Principally from the Original Soho MssNote 215 — Chapter XV · Watt again visits Cornwall—Invention of the Rotary Motion—The Patent Right again assailed.Reading editionWatt to Boulton, 16th July, 1781.◇Copy noteReturn to CHAPTER XV. Watt again visits Cornwall—Invention of the Rotary Motion—The Patent Right again assailed.