Henry Shull Arms (1912–1972) was an American and later British

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 ...

and

engineer Engineers, as practitioners of engineering, are professionals who invent, design, analyze, build and test machines, complex systems, structures, gadgets and materials to fulfill functional objectives and requirements while considering the l ...

. He worked in the British and Allied programmes to make a nuclear weapon and later developed civilian

nuclear reactor A nuclear reactor is a device used to initiate and control a fission nuclear chain reaction or nuclear fusion reactions. Nuclear reactors are used at nuclear power plants for electricity generation and in nuclear marine propulsion. Heat from nu ...

s in the UK.

Early life and education

He was born in

Tekoa, Washington Tekoa ( ) is a small farming town in Whitman County, Washington, United States. The population was 778 at the 2010 census. Based on per capita income, one of the more reliable measures of affluence, Tekoa ranks 420th of 522 areas in the state ...

, United States. He attended four schools in three different states. As a young man, he enjoyed fishing (which he pursued occasionally in Scotland later in life) and hunting. In his late teens, he worked at the Old National Bank in

Spokane Spokane ( ) is the largest city and county seat of Spokane County, Washington, United States. It is in eastern Washington, along the Spokane River, adjacent to the Selkirk Mountains, and west of the Rocky Mountain foothills, south of the Ca ...

. He studied mechanical engineering and physics at the

University of Idaho The University of Idaho (U of I, or UIdaho) is a public land-grant research university in Moscow, Idaho. It is the state's land-grant and primary research university,, and the lead university in the Idaho Space Grant Consortium. The University ...

and, aged 24, joined

Oxford Oxford () is a city in England. It is the county town and only city of Oxfordshire. In 2020, its population was estimated at 151,584. It is north-west of London, south-east of Birmingham and north-east of Bristol. The city is home to the ...

in 1936 on a

Rhodes Scholarship The Rhodes Scholarship is an international postgraduate award for students to study at the University of Oxford, in the United Kingdom. Established in 1902, it is the oldest graduate scholarship in the world. It is considered among the world' ...

, where he took an honours degree in physics. He worked on low-temperature physics - through the demagnetization of salts - under German and Hungarian Jewish refugees

Francis Simon Sir Francis Simon (2 July 1893 – 31 October 1956), was a German and later British physical chemist and physicist who devised the gaseous diffusion method, and confirmed its feasibility, of separating the isotope Uranium-235 and thus made a m ...

and

Nicholas Kurti Nicholas Kurti, ( hu, Kürti Miklós) (14 May 1908 – 24 November 1998) was a Kingdom of Hungary, Hungarian-born British physicist who lived in Oxford, UK, for most of his life. Career Born in Budapest, Kurti went to high school at the Minta G ...

at the

Clarendon Laboratory The Clarendon Laboratory, located on Parks Road within the Science Area in Oxford, England (not to be confused with the Clarendon Building, also in Oxford), is part of the Department of Physics at Oxford University. It houses the atomic and ...

Academic career

On the outbreak of

WWII 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 ...

, after working at Clarendon, he helped to remove iron fragments during neurosurgery using magnets. In 1940, his engineering knowledge was called for in the war effort to help Simon - with Kurti - continue with isotope separation and calculate the cost of building a

gaseous diffusion Gaseous diffusion is a technology used to produce enriched uranium by forcing gaseous uranium hexafluoride (UF6) through semipermeable membranes. This produces a slight separation between the molecules containing uranium-235 (235U) and uranium-2 ...

plant to separate

uranium-235 Uranium-235 (235U or U-235) is an isotope of uranium making up about 0.72% of natural uranium. Unlike the predominant isotope uranium-238, it is fissile, i.e., it can sustain a nuclear chain reaction. It is the only fissile isotope that exis ...

from the more abundant

uranium-239 Uranium (92U) is a naturally occurring radioactive element that has no stable isotope. It has two primordial isotopes, uranium-238 and uranium-235, that have long half-lives and are found in appreciable quantity in the Earth's crust. The decay pr ...

. This was under the auspices of the MAUD Committee. The calculations were followed by the plant's construction. A patent for the separation process (with

Rudolf Peierls Sir Rudolf Ernst Peierls, (; ; 5 June 1907 – 19 September 1995) was a German-born British physicist who played a major role in Tube Alloys, Britain's nuclear weapon programme, as well as the subsequent Manhattan Project, the combined Allied ...

, Simon and Arms as the applicants) was filed in 1943 (and granted in the US in 1960). He continued atomic research under Simon throughout the war, running a research group 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 ...

for 15 months, and moving from uranium

isotope separation Isotope separation is the process of concentrating specific isotopes of a chemical element by removing other isotopes. The use of the nuclides produced is varied. The largest variety is used in research (e.g. in chemistry where atoms of "marker" n ...

heat transfer Heat transfer is a discipline of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy (heat) between physical systems. Heat transfer is classified into various mechanisms, such as thermal conduction, ...

in a

. In 1945, he joined

John Cockcroft Sir John Douglas Cockcroft, (27 May 1897 – 18 September 1967) was a British physicist who shared with Ernest Walton the Nobel Prize in Physics in 1951 for splitting the atomic nucleus, and was instrumental in the development of nuclea ...

at the

National Research Council Canada The National Research Council Canada (NRC; french: Conseil national de recherches Canada) is the primary national agency of the Government of Canada dedicated to science and technology research & development. It is the largest federal research ...

, experimenting with heat transfer in the

Chalk River Laboratories Chalk River Laboratories (french: Laboratoires de Chalk River; also known as CRL, Chalk River Labs and formerly Chalk River Nuclear Laboratories, CRNL) is a Canadian nuclear research facility in Deep River, about north-west of Ottawa. CRL is a ...

NRX NRX (National Research Experimental) was a heavy-water-moderated, light-water-cooled, nuclear research reactor at the Canadian Chalk River Laboratories, which came into operation in 1947 at a design power rating of 10 MW (thermal), increasing to ...

heavy water reactor. The group returned to the UK the following year and began the

Atomic Energy Research Establishment The Atomic Energy Research Establishment (AERE) was the main Headquarters, centre for nuclear power, atomic energy research and development in the United Kingdom from 1946 to the 1990s. It was created, owned and funded by the British Governm ...

Harwell Harwell may refer to: People * Harwell (surname) * Harwell Hamilton Harris (1903–1990), American architect Places * Harwell, Nottinghamshire, England, a hamlet *Harwell, Oxfordshire, England, a village **RAF Harwell, a World War II RAF airfield, ...

; Arms was Principal Scientific Officer in charge of the engineering laboratory, developing the first British nuclear reactor and also working at

Windscale Sellafield is a large multi-function nuclear site close to Seascale on the coast of Cumbria, England. As of August 2022, primary activities are nuclear waste processing and storage and nuclear decommissioning. Former activities included nucle ...

to produce military

plutonium Plutonium is a radioactive chemical element with the symbol Pu and atomic number 94. It is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized. The element normally exhibi ...

. He became Deputy Chief Engineer of the

Capenhurst Capenhurst is a village and civil parish in Chester in the unitary authority of Cheshire West and Chester and the ceremonial county of Cheshire England. According to the 2001 Census, Capenhurst had a population of 237, increasing to 380 at the 2 ...

uranium enrichment plant. In 1953, he became Chief Development Engineer at the

English Electric N.º UIC: 9094 110 1449-3 (Takargo Rail) The English Electric Company Limited (EE) was a British industrial manufacturer formed after the Armistice of 11 November 1918, armistice of World War I by amalgamating five businesses which, during th ...

Company in

Rugby Rugby may refer to: Sport * Rugby football in many forms: ** Rugby league: 13 players per side *** Masters Rugby League *** Mod league *** Rugby league nines *** Rugby league sevens *** Touch (sport) *** Wheelchair rugby league ** Rugby union: 1 ...

, which for him necessitated further on-site education in engineering. Two years later he was also Chief Engineer of the atomic power projects at Whetstone. The company gained the contract to build a 500MW nuclear power station at Hinckley Point,

Somerset ( en, All The People of Somerset) , locator_map = , coordinates = , region = South West England , established_date = Ancient , established_by = , preceded_by = , origin = , lord_lieutenant_office =Lord Lieutenant of Somerset , lord_ ...

(which opened in 1966). Arms became a naturalised British citizen in 1955. He died aged 60, survived by his English-born wife and two children.

References

{{DEFAULTSORT:Arms, Henry Shull 1912 births 1972 deaths American physicists British physicists American engineers British engineers University of Idaho alumni Alumni of the University of Oxford American emigrants to the United Kingdom