Ruhleben internment camp was a civilian detention camp in Germany during World War I. It was located in Ruhleben, a former Vorwerk manor 10 km (6.2 mi) to the west of Berlin, now split between the districts of Spandau and Charlottenburg-Wilmersdorf. The camp was originally a harness racing track laid out north of the Berlin-Hamburg Railway line in 1908.

Sir Charles Drummond Ellis was an English physicist and scientific administrator. His work on the magnetic spectrum of the beta-rays helped to develop a better understanding of nuclear structure.