Hertha Ayrton

Phoebe Sarah Hertha Ayrton (28 April 1854 – 26 August 1923) was a British electrical engineer, mathematician, physicist and inventor, and suffragette. Known in adult life as Hertha Ayrton, born Phoebe Sarah Marks, she was awarded the Hughes Medal by the Royal Society for her work on electric arcs and ripple marks in sand and water. Provided by Wikipedia