Jan Aleksander Rajchman (
London
London is the capital and List of urban areas in the United Kingdom, largest city of England and the United Kingdom, with a population of just under 9 million. It stands on the River Thames in south-east England at the head of a estuary dow ...
, 10 August 1911 – 1 April 1989) was a Polish
electrical engineer and
computer pioneer
This is a list of people who made transformative breakthroughs in the creation, development and imagining of what computers could do.
Pioneers
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.
Biography
Jan Aleksander was son of
Ludwik Rajchman and Maria BojaĆczyk. His father was a Polish
bacteriologist
A bacteriologist is a microbiologist, or similarly trained professional, in bacteriology -- a subdivision of microbiology that studies bacteria, typically pathogenic ones. Bacteriologists are interested in studying and learning about bacteria, ...
and the founder of
UNICEF
UNICEF (), originally called the United Nations International Children's Emergency Fund in full, now officially United Nations Children's Fund, is an agency of the United Nations responsible for providing humanitarian and developmental aid to ...
. He was born in London, where his parents temporarily lived, and where his father held various positions at the Royal Institute of Public Health and King's College.
He received the Diploma of Electrical Engineering from the
Swiss Federal Institute of Technology in
Zurich in 1935, and became a
Doctor of Science
Doctor of Science ( la, links=no, Scientiae Doctor), usually abbreviated Sc.D., D.Sc., S.D., or D.S., is an academic research degree awarded in a number of countries throughout the world. In some countries, "Doctor of Science" is the degree used f ...
in 1938.
Rajchman emigrated to
America in 1935. He joined
RCA
The RCA Corporation was a major American electronics company, which was founded as the Radio Corporation of America in 1919. It was initially a patent trust owned by General Electric (GE), Westinghouse, AT&T Corporation and United Fruit Comp ...
Laboratory directed by
Vladimir K. Zworykin in January 1936.
He was a prolific inventor with 107 US patents among others logic circuits for
arithmetic. He conceived the first
read-only memory
Read-only memory (ROM) is a type of non-volatile memory used in computers and other electronic devices. Data stored in ROM cannot be electronically modified after the manufacture of the memory device. Read-only memory is useful for storing sof ...
, which was widely used in early computers. He conceived and developed the selectively addressable storage tube, the ill-fated
Selectron tube
The Selectron was an early form of digital computer memory developed by Jan A. Rajchman and his group at the Radio Corporation of America (RCA) under the direction of Vladimir K. Zworykin. It was a vacuum tube that stored digital data as elect ...
, and the
core memory
Core or cores may refer to:
Science and technology
* Core (anatomy), everything except the appendages
* Core (manufacturing), used in casting and molding
* Core (optical fiber), the signal-carrying portion of an optical fiber
* Core, the centra ...
.
He was a Fellow of the
Institute of Electrical and Electronics Engineers (IEEE), and a member of the
National Academy of Engineering
The National Academy of Engineering (NAE) is an American nonprofit, non-governmental organization. The National Academy of Engineering is part of the National Academies of Sciences, Engineering, and Medicine, along with the National Academy of ...
. He is also a member of
Sigma Xi
Sigma Xi, The Scientific Research Honor Society () is a highly prestigious, non-profit honor society for scientists and engineers. Sigma Xi was founded at Cornell University by a junior faculty member and a small group of graduate students in 1886 ...
, the
Association for Computing Machinery (ACM), the
Physical Society, the
New York Academy of Sciences
The New York Academy of Sciences (originally the Lyceum of Natural History) was founded in January 1817 as the Lyceum of Natural History. It is the fourth oldest scientific society in the United States. An independent, nonprofit organization wi ...
, and a Fellow of the
American Association for the Advancement of Science and the
Franklin Institute
The Franklin Institute is a science museum and the center of science education and research in Philadelphia, Pennsylvania. It is named after the American scientist and statesman Benjamin Franklin. It houses the Benjamin Franklin National Memori ...
. He received the 1960
IEEE Morris N. Liebmann Memorial Award
The initially called Morris Liebmann Memorial Prize provided by the Institute of Radio Engineers (IRE), the IEEE Morris N. Liebmann Memorial Award was created in 1919 in honor of Colonel Morris N. Liebmann. It was initially given to awardees who h ...
and
the 1974 IEEE
Edison Medal
The IEEE Edison Medal is presented by the Institute of Electrical and Electronics Engineers (IEEE) "for a career of meritorious achievement in electrical science, electrical engineering, or the electrical arts." It is the oldest medal in this fi ...
''For a creative career in the development of electronic devices and for pioneering work in computer memory systems.''
US patents
* Magnetic System, 1957
Sources
IEEE History SiteSmithsonian Oral History, Interview with RajchmanMemorial TributeScientist of the Day - Jan Rajchman - Linda Hall Library
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1911 births
1989 deaths
American electrical engineers
Polish emigrants to the United States
American people of Polish-Jewish descent
Fellow Members of the IEEE
IEEE Edison Medal recipients
Members of the United States National Academy of Engineering
Fellows of the American Physical Society
20th-century American engineers