Elliott Brothers
Corporate brand
UnclaimedElliott Brothers was a British instrument-making and early-computing company that helped establish the United Kingdom's postwar computer industry.
Last updated August 25, 2026
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Overview
Elliott Brothers was a British engineering and technology company whose history connected nineteenth-century scientific-instrument manufacture with the development of some of the United Kingdom's earliest electronic and stored-program computers. The business began in London around 1804, when William Elliott established a workshop producing drawing instruments, scales and scientific equipment. During the nineteenth century it expanded into surveying, navigation, telegraphy, electrical measurement and Admiralty equipment. Its products were used in scientific research, naval operations and the expanding electric-power industry. The company moved to Lewisham in 1898 and became increasingly associated with military instrumentation. It manufactured naval gunnery equipment, mechanical analogue computing devices and aircraft instruments, including equipment for navigation and engine measurement. During the First World War it developed gunnery instruments for the British Navy, and its aircraft-instrument business grew as aviation developed. In 1916 the legal name became Elliott Brothers (London) Limited. Siemens Brothers acquired shares during the 1920s, although that interest was later sold. The end of major Admiralty contracts after the Second World War exposed the limitations of a business that had not been deeply involved in wartime radar and electronics. Under director Leon Bagrit, Elliott Brothers redirected its capabilities toward electronics, automation and computing. In 1946 John Flavell Coales established research laboratories at Borehamwood. The laboratories worked on government radar projects and produced a stored-program digital computer in 1947. By 1950 the site had a staff of approximately 450 and had developed the Elliott 401, one of the company's first commercial computer systems. The Elliott 152, introduced in 1950, and subsequent machines made the company a significant British computer manufacturer. Elliott's computers served scientific, military, governmental, educational and industrial users. Its range included analogue systems for guided-missile research, special-purpose machines for government agencies, transistor computers, process-control systems and general-purpose computers such as the Elliott 803 and 903. The 803 became particularly influential in British education and research, while the company's systems also supported real-time control and military applications. The organisation employed or trained several notable figures in computing, including Tony Hoare, Dina St Johnston and John Lansdown. Hoare worked on an ALGOL 60 compiler for the Elliott 803 and on software for the Elliott 503 Mark II. The business expanded beyond computers into automation, semiconductor production and integrated-circuit research. In 1957 it changed its name to Elliott Automation Limited. In 1966 it opened an integrated-circuit design and manufacturing facility at Glenrothes, Scotland, followed by a metal-oxide-semiconductor research laboratory. By that period the wider organisation employed around 35,000 people and had interests spanning computers, aerospace instrumentation, defence electronics and control systems. In 1967 Elliott Automation merged with English Electric. The data-processing computer activities were subsequently combined with International Computers and Tabulators in 1968, creating International Computers Limited, or ICL, in a restructuring encouraged by the British government. The real-time computer activities remained outside the ICL combination and continued through successor organisations including Marconi Elliott Computer Systems and GEC Computers. The aircraft-instrument and control-system operations were retained by English Electric. As a result, Elliott Brothers ceased to exist as an independent brand, but its technical heritage continued through British computer, defence and aerospace companies.
History
Elliott Brothers originated with William Elliott's London instrument-making business, founded around 1804. The early firm made drawing instruments, balances and scientific equipment. Its later nineteenth-century expansion brought surveying, navigational, telegraphic and electrical instruments into the product range. The company supplied equipment to scientific users and the British Admiralty, and expanded into telegraph apparatus and electrical switchboards as communications and electric power developed. The business moved to Lewisham in 1898. Naval gunnery instruments and mechanical analogue computing equipment became important activities, especially during the period surrounding the First and Second World Wars. Aircraft instruments, including tachometers and altimeters, also became significant. In 1916 the company adopted the name Elliott Brothers (London) Limited. Siemens Brothers acquired shares in the 1920s, but later disposed of its interest. After the Second World War, the loss of Admiralty contracts created pressure for a strategic change. The company had not been a major wartime radar participant, so director Leon Bagrit helped redirect it toward electronics and automation. John Flavell Coales founded the Borehamwood research laboratories in 1946. The laboratories worked on government radar systems and produced a stored-program digital computer by 1947. The site developed the Elliott 401 and other systems, making Elliott one of the central British computer companies of the 1950s and 1960s. The company produced a wide range of computers. Special-purpose and analogue systems included the Elliott 153 direction-finding computer, the Elliott/GCHQ OEDIPUS system and TRIDAC, a three-dimensional analogue computer built for guided-missile research at the Royal Aircraft Establishment. Digital products included the Elliott 402, 403, 405, 802, 803, 503 and 900-series machines. The Elliott 803 was used by universities, research laboratories and industrial organisations, and supported programming in assembly language, ALGOL and FORTRAN. The 900 series provided related military, civilian and industrial-control configurations, including ruggedised systems for vehicles, ships and aircraft. Elliott was also an important training ground for British computing talent. Tony Hoare worked for the company from 1960 to 1968, writing an ALGOL 60 compiler for the Elliott 803 and contributing to work on the Elliott 503 Mark II operating system. Dina St Johnston held her first programming job at Elliott from 1953 to 1958 before founding Britain's first software house. John Lansdown used an Elliott 803 in 1963 to explore computer-assisted planning, while computer scientist Bobby Hersom worked there from 1953 to 1954. The organisation changed its name to Elliott Automation in 1957 and broadened its business into process control, aerospace systems and semiconductor technology. A joint development with NCR produced the Elliott 4100 series in the mid-1960s. In 1966 the company opened an integrated-circuit facility at Glenrothes, Scotland, followed by MOS research. In 1967 Elliott Automation merged into English Electric. The data-processing computer operations were merged with ICT in 1968 to create ICL, while real-time computing continued through Marconi Elliott Computer Systems and later GEC Computers. Other activities, including aircraft instruments and control systems, remained within English Electric and its successors.
- 1968
Data-processing business transferred into ICL
[1]The computer division is combined with International Computers and Tabulators to form International Computers Limited.
- 1967
Merger with English Electric
[1]Elliott Automation becomes part of English Electric.
- 1966
Integrated-circuit facility opens at Glenrothes
[1]Elliott Automation establishes semiconductor manufacturing and subsequently develops MOS research capability.
- 1957
Company renamed Elliott Automation
[1]The new name reflects the expansion into automation and control technologies.
- 1950
Elliott 152 appears
[1]The Elliott 152 becomes one of the company's early computer models.
- 1947
Stored-program digital computer produced
[1]The Borehamwood laboratories produce a stored-program digital computer for government-related research.
- 1946
Borehamwood research laboratories founded
[1]John Flavell Coales establishes laboratories that become the centre of Elliott's radar and computer research.
- 1916
Legal name becomes Elliott Brothers (London) Limited
[1]The company adopts the legal name associated with its best-known historical identity.
- 1898
Operations move to Lewisham
[1]The company relocates from London to a new Lewisham site and develops major naval and aviation-instrument activities there.
- 1804
William Elliott establishes an instrument-making business
[1]William Elliott begins manufacturing drawing instruments, scales and scientific equipment in London.
Products and positioning
A British engineering and computing pioneer positioned at the intersection of scientific instrumentation, defence electronics, real-time control and early digital computing.
Digital computer · 1959
Elliott 803
The Elliott 803 was a transistorised digital computer introduced in 1959 and produced in several configurations. It used serial processing and core memory, with the 803B improving execution speed through a divided data path. The system was used by universities, scientific laboratories and industrial organisations. Assembly programming, ALGOL and FORTRAN support made it suitable for teaching, scientific computation and process-control work.
Digital computer · 1956
Elliott 405
The Elliott 405 was a mid-1950s computer used in institutional and educational settings. One surviving example, known as Nellie, was donated by Nestlé to The Forest School in Winnersh. The model represents the company's transition from specialist government and scientific machines toward broader computer deployment.
Digital computer · 1963
Elliott 503
The Elliott 503 was introduced in 1963 and was software-compatible with the Elliott 803. It was a larger, more capable system intended for scientific and data-processing applications. The 503 Mark II also became associated with operating-system work undertaken by Tony Hoare during his employment at Elliott.
Military, civilian and industrial computers · 1963
Elliott 900 series
The 900 series comprised military models such as the 920A, 920B, 920M and 920C, together with civilian versions marketed as the 920A, 903 and 905. Military machines were housed in rugged cases for vehicles, ships and aircraft. Civilian models used desk-sized cabinets and supported education, scientific research and process control, with peripherals including paper-tape equipment, printers, plotters and magnetic storage.
Digital computer · 1966
Elliott 4100 series
The 4100 series was developed jointly with NCR Corporation in the mid-1960s. Elliott targeted scientific users while NCR addressed commercial applications. The systems used 24-bit words, two-accumulator architecture and expanded memory options. Planned larger models were proposed for high-performance government and national-computing applications, and the family could support graphics terminals including the 4180.
Analogue computer · 1954
TRIDAC
TRIDAC was a three-dimensional analogue computer system built for guided-missile research at the Royal Aircraft Establishment in Farnborough. It illustrates Elliott's continuing role in defence computation alongside its digital-computer programmes.
Brand decisions
1968
Transfer data-processing computer operations to ICLM&ABackground
The British government sought to create a stronger national computer company through consolidation of domestic manufacturers.
Action taken
Elliott's data-processing computer business was combined with International Computers and Tabulators to create International Computers Limited.
Aftermath
The agreement separated data-processing and real-time computer development for a period, while the latter continued under successor organisations.
1967
Merge Elliott Automation into English ElectricM&ABackground
The company had become a large diversified engineering and technology organisation spanning computers, automation, aerospace and defence.
Action taken
Elliott Automation was merged into English Electric.
Aftermath
Its computer activities were subsequently divided, with data-processing operations entering ICL and real-time computing continuing through Marconi and GEC successor companies.
1957
Broaden the business under the Elliott Automation nameStrategyBackground
The company was expanding beyond traditional instruments into computers, automation and electronic control systems.
Action taken
It changed its name from Elliott Brothers to Elliott Automation Limited.
Aftermath
The organisation subsequently expanded into semiconductor manufacturing, integrated circuits, real-time computing and aerospace control.
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