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A.O. MSS agreement air pumps amount Appendix Bersham Birmingham boring Boulton & Watt Boulton and Watt brass Chacewater charges Chipping coal Colin colliery considerable copper Cornish Cornwall cost customers cylinder diameter Drilling machine employed engine business engine erectors enquiry erected expenses fact factory firm's ibid important improved increase industry interest invention James Watt labour later lathe London M. R. Boulton machinery manufacture Matthew Boulton ment mentioned methods mill mines nozzles Office Letter Book operation organisation paid parallel motions partners partnership patent payment piece-rate pipes piston rods Poldice practice premium production profit records Roebuck share shows skilled Soho Foundry Soho Manufactory specialisation of labour steam engines stuffing box supply technical tion to-day Turning usual valves wages Watt Collection Watt to Boulton Watt's engine Wheal Wilkinson William Murdock workers workmen