Life of Richard Trevithick

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. Return to Cornwall, 1810 Wheal Prosper pole vacuum engine, 1811 Cylindrical boilers, 1811 Steam pressure, 100 lbs. Duty of engine, 40 millions - Expansive working, 1811 Herland high-pressure pole puffer, 1815 Steam pressure, 150 lbs - Boiler making - Comparison with Watt's engine - Blue - fire-steam - Patent specification Steam-ring stuffing box Engines in Lima A 33-inch pole-puffer more powerful than a 72-inch Watt engine - Description of pole engine and boilers Trevithick's cal culation Trial of Herland engines Steam-cushion Power of the pole engine - Defective workmanship Sims examines the pole-engine Opposition from shareholders Defective boilers Challenge to Woolf Davies Giddy's opinion - First cost, and cost of working one-third of the Watt engine Meeting of opposing shareholders Duty of the high-pres sure steam pole puffer-engine, 1816 Comparison with the Watt engine Combined high-pressure pole and cylinder for expansion - Wheal Alfred.