Karl Ferdinand Braun, a German physicist, developed the first cathode-ray tube oscilloscope (CRT) - the Braun tube - to record and study the time dependance of alternating currents. His paper was published on this day in 1897 in the journal Annalen der Physik und Chemie
(Annals of Physics and Chemistry
). In 1909 he was awarded the Nobel Prize for physics jointly with Guglielmo Marconi for "contributions to the development of wireless telegraphy."