Phoebe Sarah Hertha Ayrton (born Phoebe Sarah Marks; 28 April 1854 – 26 August 1923), known in her adult life as Hertha Ayrton, was an English electrical engineer, mathematician, physicist and inventor, and suffragette. She was awarded the Hughes Medal by the Royal Society for her work on electric arcs and ripple marks in sand and water.
Early life and education Ayrton was born Phoebe Sarah Marks in Portsea, Hampshire, England, on 28 April 1854. In her youth she went by the name Sarah. She was the third child of a Polish Jewish watchmaker named Levi Marks, an immigrant from Tsarist Poland; and Alice Theresa Moss, a seamstress, the daughter of Joseph Moss, a glass merchant of Portsea. Her father died in 1861, leaving Sarah's mother with seven children and an eighth expected. Sarah then took up some of the responsibility for caring for the younger children. At the age of nine, Sarah was invited by her aunts, who ran a school in northwest London, to live with her cousins and be educated with them. She was known to her peers and teachers as a fiery, occasionally crude personality. Her cousins introduced Ayrton to science and mathematics. By age 16, she was working as a governess, but she had not renounced her ambitions. Ayrton was brought up as Jewish but was agnostic by her teens. She adopted the name "Hertha" after the eponymous heroine of a poem by Algernon Charles Swinburne that criticised organised religion. It was first given to her as a nickname by her friend, the German-Jewish émigré Ottilie Blind. In 1873, Blind introduced Ayrton to Barbara Bodichon, who had co-founded Girton College, Cambridge four years prior. She would become one of Ayrton's most significant early mentors. She encouraged Ayrton to apply to Girton College and introduced Ayrton to feminist and supporter of women's education George Elliot. Elliot became fast friends with Ayrton and personally supported Ayrton's application to Girton College, Cambridge. Alongside Bodichon, fellow suffragette Helen Taylor, and Lady Louisa Goldsmid, she helped cover Ayrton's tuition fees of £92 per year alongside. Taylor paid £25 and the other three contributed the remaining sum every year. At Girton, Ayrton studied mathematics and was coached by physicist Richard Glazebrook. She also constructed a sphygmomanometer (blood pressure meter), led the choral society, founded the Girton fire brigade, and, together with Charlotte Scott, formed a mathematical club. In 1880, Ayrton passed the Mathematical Tripos, but Cambridge did not grant her an academic degree because at the time it did not award full degrees to women. Ayrton then passed an external examination at the University of London, which awarded her a Bachelor of Science degree in 1881.
Mathematics and electrical engineering work
Upon her return to London, Ayrton earned money by teaching and embroidery, ran a club for working girls, and cared for her invalid sister. She also put her mathematical skills to practical use – she taught at Notting Hill and Ealing High School, and was also active in devising and solving mathematical problems, many of which were published in "Mathematical Questions and Their Solutions" from the Educational Times. In 1884 Ayrton patented a line-divider, an engineering drawing instrument for dividing a line into any number of equal parts and for enlarging and reducing figures. The line-divider was her first major invention and, while its primary use was likely for artists for enlarging and diminishing, it was also useful to architects and engineers. Ayrton's patent application was financially supported by Louisa Goldsmid and feminist Barbara Bodichon, who together advanced her enough money to take out patents; the invention was shown at the Loan Exhibition of Women's Industries and received much press attention. Ayrton's 1884 patent was the first of many – from 1884 until her death, Ayrton registered 26 patents: five on mathematical dividers, 13 on arc lamps and electrodes, the rest on the propulsion of air. In 1884 Ayrton began attending evening classes on electricity at Finsbury Technical College, delivered by Professor William Edward Ayrton, a pioneer in electrical engineering and physics education and a fellow of the Royal Society. On 6 May 1885 she married her former teacher, and thereafter assisted him with experiments in physics and electricity. Bodichon and Goldsmid supported Ayrton's British patent application for the line-divider, and they advanced enough money to Ayrton for her to take out British and international patents. When Bodichon passed in 1891, Ayrton was deeply affected by this and greived for years aftewards. Bodichon left a legacy to Ayrton in her will, which freed up time for Ayrton to continue her original work. She hired a housekeeper and used some of the legacy to support her ageing mother. Then, she began her own investigation into the characteristics of the electric arc.
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