Christopher Hollis Johnson

CBE The Most Excellent Order of the British Empire is a British order of chivalry, rewarding contributions to the arts and sciences, work with charitable and welfare organisations, and public service outside the civil service. It was established o ...

(18 March 1904 – 9 April 1978) was a British

chemist A chemist (from Greek ''chēm(ía)'' alchemy; replacing ''chymist'' from Medieval Latin ''alchemist'') is a scientist trained in the study of chemistry. Chemists study the composition of matter and its properties. Chemists carefully describe th ...

and

physicist A physicist is a scientist who specializes in the field of physics, which encompasses the interactions of matter and energy at all length and time scales in the physical universe. Physicists generally are interested in the root or ultimate caus ...

. He worked in weapons research and was part of the technical committee of Tube Alloys, the UK's secret atomic weapon development programme.

Biography

He was born in

Reading Reading is the process of taking in the sense or meaning of Letter (alphabet), letters, symbols, etc., especially by Visual perception, sight or Somatosensory system, touch. For educators and researchers, reading is a multifaceted process invo ...

to Agnes Mary Hollis and Ernest Gladstone Johnson. His father was a

hosier Hosiery, also referred to as legwear, describes garments worn directly on the feet and legs. The term originated as the collective term for products of which a maker or seller is termed a hosier; and those products are also known generically as h ...

outfitter An outfitter is a shop or person that sells specialized clothes (an ''outfit'' is a set of clothing). More specifically, it is a company or individual who provides or deals in equipment and supplies for the pursuit of certain activities. In North ...

and

haberdasher In British English, a haberdasher is a business or person who sells small articles for sewing, dressmaking and knitting, such as buttons, ribbons, and zippers; in the United States, the term refers instead to a retailer who sells men's clothing, ...

. In 1930, he married Irene Kathleen Gilbert. Before

World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...

, he researched valence theory, polarimetry and related

optically active Optical rotation, also known as polarization rotation or circular birefringence, is the rotation of the orientation of the plane of polarization about the optical axis of linearly polarized light as it travels through certain materials. Circul ...

compounds. By 1939, he was a senior lecturer in inorganic chemistry at the

University of Birmingham , mottoeng = Through efforts to heights , established = 1825 – Birmingham School of Medicine and Surgery1836 – Birmingham Royal School of Medicine and Surgery1843 – Queen's College1875 – Mason Science College1898 – Mason Univers ...

. At the time, concerns had grown about the possibility of the creation of an atomic weapon by an aggressive

Nazi Germany Nazi Germany (lit. "National Socialist State"), ' (lit. "Nazi State") for short; also ' (lit. "National Socialist Germany") (officially known as the German Reich from 1933 until 1943, and the Greater German Reich from 1943 to 1945) was ...

. Johnson's Birmingham colleague

Mark Oliphant Sir Marcus Laurence Elwin Oliphant, (8 October 1901 – 14 July 2000) was an Australian physicist and humanitarian who played an important role in the first experimental demonstration of nuclear fusion and in the development of nuclear weapon ...

directed Rudolf Peierls and

Otto Frisch Otto Robert Frisch FRS (1 October 1904 – 22 September 1979) was an Austrian-born British physicist who worked on nuclear physics. With Lise Meitner he advanced the first theoretical explanation of nuclear fission (coining the term) and first ...

(refugee physicists also at Birmingham) to investigate if indeed such a weapon was feasible and in March 1940 Frisch, using Peierl's formula, got an alarming result which confirmed that a small mass of uranium-235 could have a devastating effect; the Frisch-Peierls memorandum was circulated secretly by Oliphant and immediate action taken to try and secure supplies of uranium ore. What came to be called the MAUD Technical Committee was created in response to the Frisch-Peierls memorandum. As well as a Policy Committee, a Technical Committee contained scientists and engineers mainly from four British universities, Liverpool, Oxford, Cambridge and Birmingham. At Birmingham, the committee was led by Peierls assisted by Johnson,

Nobel Prize The Nobel Prizes ( ; sv, Nobelpriset ; no, Nobelprisen ) are five separate prizes that, according to Alfred Nobel's will of 1895, are awarded to "those who, during the preceding year, have conferred the greatest benefit to humankind." Alfr ...

winner Norman Haworth and, in 1941,

Klaus Fuchs Klaus Emil Julius Fuchs (29 December 1911 – 28 January 1988) was a German theoretical physicist and atomic spy who supplied information from the American, British and Canadian Manhattan Project to the Soviet Union during and shortly aft ...

, who was later exposed as a

Soviet The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, ...

spy. Haworth led the chemists studying the properties of

uranium hexafluoride Uranium hexafluoride (), (sometimes called "hex") is an inorganic compound with the formula UF6. Uranium hexafluoride is a volatile white solid that reacts with water, releasing corrosive hydrofluoric acid. The compound reacts mildly with alumin ...

; Johnson's experiments resulted in a paper describing how it attacked various materials. The research, as part of Tube Alloys, was subsumed into the

Manhattan Project The Manhattan Project was a research and development undertaking during World War II that produced the first nuclear weapons. It was led by the United States with the support of the United Kingdom and Canada. From 1942 to 1946, the project w ...

. In 1958, Johnson was awarded a

for his research. From 1958 to 1964, he was the Director of the Explosives Research and Development Establishment at Waltham Abbey, part of the Ministry of Aviation, when he retired. He died in 1978, aged 74.

References

{{DEFAULTSORT:Johnson, Christopher Hollis British physicists British chemists 1904 births 1978 deaths Alumni of the University of Birmingham Commanders of the Order of the British Empire