Elmer Ambrose Sperry Sr. (October 12, 1860–June 16, 1930) was an American inventor and entrepreneur. His inventions made contributions to the railroad, automobile, shipping and aircraft industries. He also developed a number of inventions used by the U.S. and allied militaries. He is known as the “father of modern navigation technology.”
Railroad safety
Since U.S. railroads began in the early 1830s, railroad engineers sought to prevent failures in the...