Obituary [Cornelius Johannes de Groot]

With deepest regret the Institute of Radio Engineers announces the death of Cornelius Johannes de Groot. Dr. de Groot was born in den Helder, Holland in 1883, and was in \´succession a student at the Technical College, Delft, Holland and the Technical College at Karlsruhe, Germany. For many years he was a Fellow of the Institute of Radio Engineers. He was one of the pioneers both in the long wave and short wave field of radio communication, was responsible for the installation of the highly modern radio stations in the Dutch East Indies (which communicate directlywith Holland and other parts of the world), and has made many fundamental studies of atmospheric disturbances and transmission phenomena which he has published in brilliant papers in the "Proceedings of the Institute of Radio Engineers", and elsewhere, His careful observations and ingenious deductions and conclusions from them have been repeatedly verified by later investigations.