This image is a centrifugal pump with one half of the casing removed. S is a hollow hub, a is a curved arm, also called a vane or wing, and are revolved with a high velocity of the arrow. The air between them is driven out by the discharge and pipe D. A centrifugal pump is a valuable instrument for raising water to enormous heights.
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International Correspondence Schools A Textbook on Mechanical and Electrical Engineering (Scranton, PA: International Textbook Company, 1897)