The cavity magnetron is a high-power vacuum tube used in early radar systems and subsequently in microwave ovens and in linear particle accelerators. A cavity magnetron generates microwaves using the interaction of a stream of electrons with a magnetic field, while moving past a series of cavity resonators, which are small, open cavities in a metal block. Electrons pass by the cavities and cause microwaves to oscillate within, similar to the functioning of a whistle producing a tone when excited by an air stream blown past its opening. The resonant frequency of the arrangement is determined by the cavities' physical dimensions. Unlike other vacuum tubes, such as a klystron or a traveling-wave tube (TWT), the magnetron cannot function as an amplifier for increasing the intensity of an applied microwave signal; the magnetron serves solely as an electronic oscillator generating a microwave signal from direct current electricity supplied to the vacuum tube.
Vannevar Bush was an American engineer, inventor and science administrator, who during World War II headed the U.S. Office of Scientific Research and Development (OSRD), through which almost all wartime military R&D was carried out, including important developments in radar and the initiation and early administration of the Manhattan Project. He emphasized the importance of scientific research to national security and economic well-being, and was chiefly responsible for the movement that led to the creation of the National Science Foundation.
Science and technology in the United States has a long history, producing many important figures and developments in the field. The United States of America came into being around the Age of Enlightenment, an era in Western philosophy in which writers and thinkers, rejecting the perceived superstitions of the past, instead chose to emphasize the intellectual, scientific and cultural life, centered upon the 18th century, in which reason was advocated as the primary source for legitimacy and authority. Enlightenment philosophers envisioned a "republic of science," where ideas would be exchanged freely and useful knowledge would improve the lot of all citizens.
A proximity fuze is a fuze that detonates an explosive device automatically when it approaches within a certain distance of its target. Proximity fuzes are designed for elusive military targets such as airplanes and missiles, as well as ships at sea and ground forces. This sophisticated trigger mechanism may increase lethality by 5 to 10 times compared to the common contact fuze or timed fuze.
Technology played a significant role in World War II. Some of the technologies used during the war were developed during the interwar years of the 1920s and 1930s, much was developed in response to needs and lessons learned during the war, while others were beginning to be developed as the war ended. Many wars have had major effects on the technologies that we use in our daily lives, but World War II had the greatest effect on the technology and devices that are used today. Technology also played a greater role in the conduct of World War II than in any other war in history, and had a critical role in its outcome.
The Norwegian Defence Research Establishment is a research institute that conducts research and development on behalf of the Norwegian Armed Forces and provides expert advice to political and military defence leaders. In particular, its task is to keep track of advances in the fields of science and military technology which might affect the assumptions on which Norwegian security policy and/or defence planning is based.
Ivan Alexander Getting was an American physicist and electrical engineer, credited with the development of the Global Positioning System (GPS). He was the co-leader of the research group which developed the SCR-584, an automatic microwave tracking fire-control system, which enabled M9 Gun Director directed anti-aircraft guns to destroy a significant percentage of the German V-1 flying bombs launched against London late in the Second World War.
Portland High School is a public high school established in 1821 in Portland, Maine, United States, which educates grades 9–12. The school is part of the Portland Public Schools district, and is one of three high schools in that district, along with Deering High School and Casco Bay High School. It is located at 284 Cumberland Avenue in downtown Portland. Along with its sister school, Deering High School, a family can choose which of the two to send their students to.
The Johns Hopkins University Applied Physics Laboratory is a not-for-profit university-affiliated research center (UARC) in Howard County, Maryland. It is affiliated with Johns Hopkins University and employs 8,700 people as of 2024. APL is the nation's largest UARC.
The Tizard Mission, officially the British Technical and Scientific Mission, was a delegation from the United Kingdom that visited the United States during World War II to share secret research and development (R&D) work that had military applications. It received its popular name from the programme's instigator, Henry Tizard, a British scientist and chairman of the Aeronautical Research Committee which had orchestrated the development of radar.
Hendrik Wade Bode was an American engineer, researcher, inventor, author and scientist, of Dutch ancestry. As a pioneer of modern control theory and electronic telecommunications he revolutionized both the content and methodology of his chosen fields of research. His synergy with Claude Shannon, the father of information theory, laid the foundations for the technological convergence of the information age.
James Phinney Baxter III was an American historian, educator, and academic, who won the 1947 Pulitzer Prize for History for his book Scientists Against Time (1946). He was also the author of The Introduction of the Ironclad Warship (1933).
The military funding of science has had a powerful transformative effect on the practice and products of scientific research since the early 20th century. Particularly since World War I, advanced science-based technologies have been viewed as essential elements of a successful military.
Through history, the systems of economic support for scientists and their work have been important determinants of the character and pace of scientific research. The ancient foundations of the sciences were driven by practical and religious concerns and or the pursuit of philosophy more generally. From the Middle Ages until the Age of Enlightenment, scholars sought various forms of noble and religious patronage or funded their own work through medical practice. In the 18th and 19th centuries, many disciplines began to professionalize, and both government-sponsored "prizes" and the first research professorships at universities drove scientific investigation. In the 20th century, a variety of sources, including government organizations, military funding, patent profits, corporate sponsorship, and private philanthropies, have shaped scientific research.
The following are the Pulitzer Prizes for 1947.
The Allies of World War II cooperated extensively in the development and manufacture of new and existing technologies to support military operations and intelligence gathering during the Second World War. There are various ways in which the allies cooperated, including the American Lend-Lease scheme and hybrid weapons such as the Sherman Firefly as well as the British Tube Alloys nuclear weapons research project which was absorbed into the American-led Manhattan Project. Several technologies invented in Britain proved critical to the military and were widely manufactured by the Allies during the Second World War.
Joan, Lady Curran, born Joan Elizabeth Strothers, was a Welsh physicist who played important roles in the development of radar and the atomic bomb during the Second World War. She devised a method of releasing chaff, a radar countermeasure technique credited with reducing losses among Allied bomber crews. She also worked on the development of the proximity fuse and the electromagnetic isotope separation process for the atomic bomb.
Merle Anthony Tuve was an American geophysicist who was the Chairman of the Office of Scientific Research and Development's Section T, which was created in August 1940. He was founding director of the Johns Hopkins University Applied Physics Laboratory, the main laboratory of Section T during the war from 1942 onward. He was a pioneer in the use of pulsed radio waves whose discoveries opened the way to the development of radar and nuclear energy.
The Radiation Laboratory, commonly called the Rad Lab, was a microwave and radar research laboratory located at the Massachusetts Institute of Technology (MIT) in Cambridge, Massachusetts. It was first created in October 1940 and operated until 31 December 1945 when its functions were dispersed to industry, other departments within MIT, and in 1951, the newly formed MIT Lincoln Laboratory.
William Alan Stewart Butement was a New Zealand-born British-Australian defence scientist and public servant. A native of New Zealand, he made extensive contributions to radar development in Great Britain during World War II, served as the first chief scientist for the Australian Defence Scientific Service, then ended his professional career with a research position in private business.
