Hertha Marks Ayrton was a British mathematician, engineer, physicist and inventor who was awarded the Hughes Medal in 1906 by the Royal Society for her work on electric arcs and ripples in sand and water. Born in Portsea, Hampshire in 1854, she studied at Girton College, Cambridge, and registered 26 patents for mathematical divders, arc lamps and electrodes between 1884 and her death in 1923. As Google marks what would have been her 162nd birthday with a Doodle on its homepage, here are five facts...