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In 1919 Bush joined the electrical engineering department at MIT. During the 1920s and '30s, he and his research laboratory became the preeminent designers and builders of analog computers. (Analog computers represent data with some physical quantity, such as voltage, that is allowed to vary continuously. In contrast, digital computers only allow a discrete set of values for data, typically by using two voltage levels, off and on, to represent the binary numbers, 0 and 1.) Originally developed to solve complex problems associated with long-distance power lines, Bush's analog computers were also applied to many other engineering problems. By 1931 his most successful machine, known as the Differential Analyzer , was operational. Utilizing a complicated arrangement of gears and cams driven by steel shafts, the Differential Analyzer could obtain practical (albeit approximate) solutions to problems which up to that point had been prohibitively difficult. The Differential Analyzer was a great success; it and various copies located at other laboratories were soon employed in solving diverse engineering and physics problems. An even more successful machine, the so-called Rockefeller Differential Analyzer (funded in part by the Rockefeller Foundation), was built in 1935 and proved the most powerful computer available before the arrival of digital computers about 1945. It was enlisted by the military in World War II to produce ballistics tables.

Bush, like other electrical engineers of his generation, was thus helping to move his profession from a focus on the creation and delivery of electric power toward the problem of designing electronic devices for an industrial and electricity-based society. In 1922 he was among the founders of what would become the Raytheon Company, a manufacturer of electronic parts. Over the span of his life, Bush held 49 electronics patents.

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