Turbine waterwheels. Gas, steam, and water turbines have a casing around the blades that contains and controls the working fluid. Credit for invention of the steam turbine is given both to Anglo-Irish engineer Sir Charles Parsons (1854–1931) for invention of the reaction turbine, and to Swedish engineer Gustaf de Laval (1845–1913) for invention of the impulse turbine. Modern steam turbines frequently employ both reaction and impulse in the same unit, typically varying the degree of reaction and impulse from the blade root to its periphery. The word "turbine" was coined in 1822 by the French mining engineer Claude Burdin from the
Potlatch (steamship) Potlatch (steamship) Potlatch was a steamship which was operated on Hood Canal from 1912 to 1917, on Puget Sound from 1917 to 1937, although the vessel was little used after 1917. Following the loss of the nearly-new but wooden steamship "Clallam" in 1904, Joshua Green, president of the Puget Sound Navigation Company, owner of the "Clallam" and the dominant Puget Sound shipping concern, announced that the company would replace its wooden steamships with ones built of steel. As part of this effort, the steel steamers "Potlatch" and "Sol Duc" were built simultaneously in Seattle by the Seattle Construction and Drydock