Helen Klaassen

She was the daughter of Hendericus Klaassen, a geologist who had emigrated from Prussia in the 1840s.

[1] She attended the University of Cambridge, carrying out electrochemical experiments at the Cavendish Laboratory in the late 1880s and 1890s.

At the suggestion of J. J. Thompson, she studied electric resistance curves in sulphuric acid.

[3][4] Her most notable work was a collaboration with Alfred Ewing on the magnetic properties of iron, published by the Royal Society of London in 1893.

Klaassen was a member of the National Union of Scientific Workers[5] and also took an interest in nursing.