Lives of Boulton and Watt. Principally from the Original Soho MssNote 145 — Chapter XII · Boulton and Watt begin the Manufacture of Steam-engines.Reading editionBoulton to Watt, 23rd April, 1776. Boulton MSS.◇Copy noteReturn to CHAPTER XII. Boulton and Watt begin the Manufacture of Steam-engines.