C. Ainsworth Mitchell

Charles Ainsworth Mitchell (20 November 1867 – 5 January 1948) was a British chemist and forensic scientist who made a special study of the microscopic and chemical study of handwriting. He was a Fellow of the Royal Institute of Chemistry and the Chemical Society, and member of the Society of Public Analysts He was editor of The Analyst for 25 years, president of the Medico-Legal Society (1935–1937), and vice president of the Society of Chemistry (1937–1940).

Life

Mitchell was born 20 November 1867 in Thetford, England, the third son of Dr. T. H. Mitchell. He was educated at King William's College, and Exeter College, Oxford, graduating in 1889. In 1899 he married Edith Boyle Keely.

Chemist

As a chemist and a scientist, Mitchell's work covered a wide range of topics. He became a fellow of the Royal Institute of Chemistry in 1897 and of the Chemical Society in 1916. In 1907 he advocated using a pinhole camera to photograph the sun in an article in Knowledge and Scientific News, a method which he notes was known as early as 1615 but seemed to have been forgotten. In 1911, he advocated the switch from lead to copper pipes for drinking water. His reasoning was that copper would better be able to alert the drinker to an excess of poisonous sulphates in the water. In 1920, he became editor of The Analyst, a journal of the Chemical Society, and under 25 years of his editorship the journal expanded in scope and increased in reputation.

Criminologist

In 1911 he was head of the inspection bureau of Scotland Yard. He frequently served as an expert witness. In 1915, he gave testimony about the invisible ink used in the case of German spy, Anton Kuepferle.