Lewis Fry Richardson

Lewis Fry Richardson, FRS (11 October 1881 – 30 September 1953) was an English mathematician, physicist, meteorologist, psychologist, and pacifist who pioneered modern mathematical techniques of weather forecasting, and the application of similar techniques to studying the causes of wars and how to prevent them. He is also noted for his pioneering work concerning fractals and a method for solving a system of linear equations known as modified Richardson iteration.

Early life

Lewis Fry Richardson was the youngest of seven children born to Catherine Fry (1838–1919) and David Richardson (1835–1913). They were a prosperous Quaker family, David Richardson operating a successful tanning and leather-manufacturing business.

At age 12 he was sent to a Quaker boarding school, Bootham School in York, where he received an education in science, which stimulated an active interest in natural history. In 1898 he went on to Durham College of Science (a college of Durham University) where he took courses in mathematical physics, chemistry, botany, and zoology. He proceeded in 1900 to King's College, Cambridge, where he was taught physics in the natural sciences tripos by (among others) J. J. Thomson and graduated with a first-class degree in 1903. At age 47 he received a doctorate in mathematical psychology from the University of London.

Career

Richardson's working life represented his eclectic interests:
* National Physical Laboratory (1903–1904).
* University College Aberystwyth (1905–1906).
* Chemist, National Peat Industries (1906–1907).
* National Physical Laboratory (1907–1909).
* Manager of the physical and chemical laboratory, Sunbeam Lamp Company (1909–1912).
* Manchester College of Technology (1912–1913).
* Meteorological Office – as superintendent of Eskdalemuir Observatory (1913–1916).
* Friends Ambulance Unit in France (1916–1919).
* Meteorological Office at Benson, Oxfordshire (1919–1920).
* Head of the Physics Department at Westminster Training College (1920–1929).
* Principal, Paisley Technical College, now part of the University of the West of Scotland (1929–1940).

In 1926, he was elected to the Fellowship of the Royal Society

Pacifism

Richardson's Quaker beliefs entailed an ardent pacifism that exempted him from military service during World War I as a conscientious objector, though this subsequently disqualified him from having any academic post. Richardson worked from 1916 to 1919 for the Friends' Ambulance Unit attached to the 16th French Infantry Division. After the war, he rejoined the Meteorological Office but was compelled to resign on grounds of conscience when it was amalgamated into the Air Ministry in 1920. He subsequently pursued a career on the fringes of the academic world before retiring in 1940 to research his own ideas. His pacifism had direct consequences on his research interests. According to Thomas Körner, the discovery that his meteorological work was of value to chemical weapons designers caused him to abandon all his efforts in this field, and destroy findings that he had yet to publish.

Weather forecasting

Richardson's interest in meteorology led him to propose a scheme for weather forecasting by solution of differential equations, the method used nowadays, though when he published ''Weather Prediction by Numerical Process'' in 1922, suitable fast computing was unavailable. He described his ideas thus:

"After so much hard reasoning, may one play with a fantasy? Imagine a large hall like a theatre, except that the circles and galleries go right round through the space usually occupied by the stage. The walls of this chamber are painted to form a map of the globe. The ceiling represents the north polar regions, England is in the gallery, the tropics in the upper circle, Australia on the dress circle and the Antarctic in the pit.

A myriad computers eople who computeare at work upon the weather of the part of the map where each sits, but each computer attends only to one equation or part of an equation. The work of each region is coordinated by an official of higher rank. Numerous little "night signs" display the instantaneous values so that neighbouring computers can read them. Each number is thus displayed in three adjacent zones so as to maintain communication to the North and South on the map.

From the floor of the pit a tall pillar rises to half the height of the hall. It carries a large pulpit on its top. In this sits the man in charge of the whole theatre; he is surrounded by several assistants and messengers. One of his duties is to maintain a uniform speed of progress in all parts of the globe. In this respect he is like the conductor of an orchestra in which the instruments are slide-rules and calculating machines. But instead of waving a baton he turns a beam of rosy light upon any region that is running ahead of the rest, and a beam of blue light upon those who are behindhand.

Four senior clerks in the central pulpit are collecting the future weather as fast as it is being computed, and despatching it by pneumatic carrier to a quiet room. There it will be coded and telephoned to the radio transmitting station. Messengers carry piles of used computing forms down to a storehouse in the cellar.

In a neighbouring building there is a research department, where they invent improvements. But there is much experimenting on a small scale before any change is made in the complex routine of the computing theatre. In a basement an enthusiast is observing eddies in the liquid lining of a huge spinning bowl, but so far the arithmetic proves the better way. In another building are all the usual financial, correspondence and administrative offices. Outside are playing fields, houses, mountains and lakes, for it was thought that those who compute the weather should breathe of it freely." (Richardson 1922)

When news of the first weather forecast by the first modern computer, ENIAC, was received by Richardson in 1950, he responded that the results were an "enormous scientific advance." The first calculations for a 24-hour forecast took ENIAC nearly 24 hours to produce.

He was also interested in atmospheric turbulence and performed many terrestrial experiments. The Richardson number, a dimensionless parameter of the theory of turbulence is named for him. He famously summarised turbulence in rhyming verse in ''Weather Prediction by Numerical Process'' (p 66):

''Big whirls have little whirls that feed on their velocity,''
:''and little whirls have lesser whirls and so on to viscosity.''

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