He received his doctorate in 1902 under Emil Warburg ; his thesis was on the cathode gradient of alkali metals .
Mey studied physics and mathematics at the Humboldt University of Berlin from 1897 .
Mey received Mey 's doctorate in 1902 under Emil Warburg ; his thesis was on the cathode gradient of alkali metals .
Mey studied physics and mathematics at the Humboldt University of Berlin from 1897 .