President Ulysses S. Grant and Emperor Pedro II of Brazil starting the Corliss Centennial Engine at the opening ceremonies of the Centennial Exposition in Philadelphia, 1876. The Corliss steam engine was named after the American engineer George Henry Corliss, who in 1849 invented the efficient valve gear it used. Engraving from Harper's Weekly, May 27, 1876, from a sketch by Theodore R. Davis.

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