Dirk Coster, was a Dutch physicist. He was a Professor of Physics and Meteorology at the University of Groningen. Coster was born in Amsterdam. On February 26, 1919, he married Lina Maria Wijsman, who held a degree in Oriental languages. Eventually, she was one of the first women to obtain a doctorate degree in this field from the University of Leiden. Dirk and Miep had two sons and two daughters. Coster is known as the co-discoverer of Hafnium in 1923, along with George Charles von Hevesy, by means of X-ray spectroscopic analysis of zirconium ore. The discovery took place in Copenhagen, Denmark. Hafnia is the Latin name for Copenhagen. Wikipedia [ - ]

Dirk Coster, was a Dutch physicist. He was a Professor of Physics and Meteorology at the... [ + ]