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History
Born Kathleen Yardley in Newbridge, southern Ireland, 1903; moved with her family to Seven Kings, Essex, 1908; attended the County High School for Girls, Ilford; attended Bedford College for Women and graduated in physics, 1922; finished first in the University of London BSc Honours exam; gained a place in W H Bragg's research team, first at University College London, and subsequently at the Royal Institution, 1923-1927; working with W T Astbury, began to apply space group theories to the study of X-ray diffraction patterns from crystals; with Astbury, published 'Tabulated data for the examination of the 230 space-groups by homogeneous X-rays' in the Royal Society's Philosophical Transactions, 1924; married Thomas Jackson Lonsdale, 1927; worked at the University of Leeds, carrying out analyses of hexamethylbenzene and hexachlorobenzene crystals; returned to the Royal Institution, 1931-1946; concentrated on research on diamagnetic anisotropy; work on the magnetic anisotropy of benzil led to her studies of disorder in crystals caused by thermal motions, one of her principal research interests for the remainder of her career; a member of the editorial group concerned with the production of new tables for crystal structure determination, providing the structure factor formulae for each space group, resulting in the publication of the International Tables, 1935; became a Quaker, 1935; her pacifism led her to refuse to register for civil defence duties and, refusing to pay a fine imposed for non-registration, imprisoned in Holloway gaol for a month, 1943; one of the first two women to be elected Fellow of the Royal Society, 1945; Reader in Crystallography, University College London, 1946-1949; first Chairman of the Commission on Tables, 1948; Professor of Chemistry, University College London, 1949; established her own research school and introduced new courses in crystallography for undergraduates and for graduates; her diverse interests included methonium compounds, urinary calculi and synthetic diamonds, though work on the International Tables diverted considerable time away from research; principal editor in the production of the new volumes of International Tables, 1951; Dame Commander of the Order of the British Empire, 1956; awarded the Davy Medal of the Royal Society, 1957; British Association General Secretary, 1959-1964, President of the Physics Section, 1967, and (first female) President, 1968; member of Council and Vice-President of the Royal Society, 1960-1961; Vice President of the International Union of Crystallography, 1960-1966, and President, 1966; received honorary degrees from several universities; Vice-President of the Atomic Scientists' Association; President of the Women's International League for Peace and Freedom; attended several Pugwash Conferences on World Affairs and expressed her hopes for peace in numerous lectures and articles, including a Penguin Special Is Peace Possible?; her experience in prison led to an interest in penal reform and she was a member of the Board of Visitors, Aylesbury Prison for Women and Borstal Institution for Girls, and Deputy Chairman of the Board of Visitors of Bullwood Hall Borstal, Essex; her interests also included scientific ethics; travelled extensively in connection with her scientific career and peace interests; attended scientific conferences including Congresses of the International Union of Crystallography; undertook some foreign engagements on behalf of the Society of Friends; died, 1971.