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She was the subeditor of the International Phonetic Association's journal Le Maître Phonétique for more than a decade, and was praised in her day for her teaching, both during the academic term and in the department's summer vacation courses. Jones wrote in his obituary of her that she was "one of the finest phoneticians in the world".

Armstrong grew up in Northern England. She graduated from the University of Leeds, where she studied French and Latin. She taught French in an elementary school in the London suburbs for a while, but then joined the University College Phonetics Department, headed by Daniel Jones. Her most notable works were the 1926 book A Handbook of English Intonation, co-written with Ward, the 1934 paper "The Phonetic Structure of Somali", and the book The Phonetic and Tonal Structure of Kikuyu, published posthumously in 1940 after she died of a stroke in 1937 at age 55

Lilias Eveline Armstrong (29 September 1882 – 9 December 1937) was an English phonetician. She worked at University College London, where she attained the rank of reader. Armstrong is most known for her work on English intonation as well as the phonetics and tone of Somali and Kikuyu. Her book on English intonation, written with Ida C. Ward, was in print for 50 years. Armstrong also provided some of the first detailed descriptions of tone in Somali and Kikuyu.

Born into the periphery of the British aristocracy, her parents were Henry Fane and his wife, Elizabeth, née Swymmer; she married a politician and member of the establishment, Charles Arbuthnot. Thus well connected, she was perfectly placed to meet many of the key figures of the Regency and late Napoleonic eras. Recording meetings and conversations often verbatim, she has today become the "Mrs. Arbuthnot" quoted in many biographies and histories of the era. Her observations and memories of life within the British establishment are not confined to individuals but document politics, great events and daily life with an equal attention to detail, providing historians with a clear picture of the events described. Her diaries were themselves finally published in 1950 as The Journal of Mrs Arbuthnot.

Harriet Arbuthnot (10 September 1793 – 2 August 1834) was an early 19th-century English diarist, social observer and political hostess on behalf of the Tory party. During the 1820s she was the closest woman friend of the hero of Waterloo and British Prime Minister, the 1st Duke of Wellington. She maintained a long correspondence and association with the Duke, all of which she recorded in her diaries, which are consequently extensively used in all authoritative biographies of the Duke of Wellington.