With a hiss of steam and the clank of pistons, the Corliss engine shook to life, as did the fair it powered. The great engine, according to historian Esther M. Klein, “symbolized the nation’s growth.” i Journalists like William Dean Howells saw it in poetic terms. “It rises loftily in the centre of the huge structure,” he wrote, “an athlete of steel and iron with not a superfluous ounce of metal on it; the mighty walking beams plunge their pistons downward, the enormous flywheel revolves with a hoarded power that makes all tremble, the hundred life like details do their office with unerring intelligence.” Howells also felt that technology was America’s answer to the art and culture of Europe. “Yes, it is still in these things of iron and steel that the national genius most freely speaks,” he concluded, “by and by the inspired marbles, the breathing canvases, the great literature; for the present America is voluble in the strong metals and their infinite uses.” ii
The first practical use of the steam engine had been in 1802, when two Watt steam engines powered the Philadelphia Waterworks at Centre Square. Five years after that, Robert Fulton built the first commercial steamboat, which plied the Hudson River between New York and Albany. Much progress had been made in the decades leading up to the 1876 Centennial. The Corliss engine in Machinery Hall was of a type used to power large, fast coastal and river steamers. It’s variable valve timing, an idea patented by inventor George Henry Corliss in 1849, made this engine 30% more efficient than earlier steam engines. The Centennial engine towered 45 feet in the air and boasted a flywheel 30 feet in diameter. Its two cylinders, each nearly four feet in diameter, contained two rotating steam and two rotating exhaust valves. The pistons turned a crankshaft at 36 revolutions per minute, and the engine itself was rated at 1,400 horsepower. iv
Nearly three decades after the Centennial, steam power spawned and was eventually supplanted by a new force: electricity. Historian Henry Adams spent hours gazing at another massive Corliss engine at the 1893 Columbian Exposition in Chicago. This time, the Corliss engine did not directly power the fair’s machinery. It powered an electrical dynamo, which in turn powered thousands of incandescent bulbs and electrical appliances.
As for the Centennial Corliss engine, it remained in service long after the exposition closed. George Pullman, president of the Chicago-based railroad car manufacturer, purchased the engine to power one of his factories. The old engine was not scrapped until 1910, after thirty four years of service. By then, the old fashioned Corliss engine, with its clunky pistons and cumbersome “walking beam,” was completely obsolete. It had been supplanted by Charles Parsons’ compact, much more efficient steam turbine, which are still used in power plants and ships to this day.
[i] Esther M. Klein, Fairmount Park: A History and Guidebook, World’s Largest Municipal Park (Bryn Mawr, Pennsylvania: Harcum Junior College Press, 1974), p.29.
[ii] About the Corliss Engine, Dr. George F. Corliss, MU EEC http://www.eng.mu.edu/corlissg/gc_engine.html Accessed May 16, 2010.
[iii] “More About Bell,” The Telephone, The American Experience, PBS. http://www.pbs.org/wgbh/amex/telephone/peopleevents/mabell.html Accessed May 16, 2010.
[iv] About the Corliss Engine, Dr. George F. Corliss, MU EEC http://www.eng.mu.edu/corlissg/gc_engine.html Accessed May 16, 2010.
[v] Henry Adams, The Education of Henry Adams, 1918. http://www.bartleby.com/159/25.html