page_title: Jonathan Zenneck
section_title: Middle years
hierarchical_section_title: Jonathan Zenneck / Middle years
caption_attribution_description: Deutsch: Denkmal de:Jonathan Zenneck in de:Cuxhaven im Mai 2008. Das Denkmal trägt auf den drei übrigen Seiten die Inschrift: „Von dieser Stelle aus führte Jonathan Zenneck 1899-1900 seine ersten funktelegrafischen Versuche durch und schuf damit die Grundlagen zur Einführung eines deutschen Seefunkdienstes“. English: Memorial en:Jonathan Zenneck in en:Cuxhaven, May 2008
context_page_description: Jonathan Adolf Wilhelm Zenneck was a physicist and electrical engineer. Zenneck was born in Ruppertshofen, Württemberg. Zenneck contributed to researches in radio circuit performance and to the scientific and educational contributions to the literature of the pioneer radio art. Zenneck improved the Braun cathode ray tube, by adding a second deflection structure at right angles to the first, which allowed two-dimensional viewing of a waveform. This two-dimensional display is fundamental to the oscilloscope.
context_section_description: In 1895, Zenneck left zoology and turned over to the new field of radio science, He became assistant to Ferdinand Braun and lecturer at "Physikalisches Institut" in Strasbourg, Alsace. Nikola Tesla's lectures introduced him to the wireless sciences. In 1899, Zenneck started propagation studies of wireless telegraphy, first over land, but then became more interested in the larger ranges that were reached over sea. In 1900 he started ship-to-coast experiments in the North Sea near Cuxhaven, Germany. in 1902 he conducted tests of directional antennas. In 1905, Zenneck left Strasbourg since he was appointed assistant-professor at the Danzig Technische Hochschule and in 1906, he became professor of experimental physics in the Braunschweig Technische Hochschule. Also in 1906, Zenneck wrote "Electromagnetic Oscillations and Wireless Telegraphy", the then standard textbook on the subject). In 1909, he joined Badische Anilin und Sodafabrik in Ludwigshafen to experiment with electrical discharges in air to produce bound nitrogen as fertilizer.
  Zenneck analyzed solutions to Maxwell's equations that are localized around an interface between a conducting medium and a non-conducting medium. In these solutions, the electric field strength decays exponentially in each medium as distance from the interface increases.  These waves are sometimes called Zenneck waves.  Zenneck analyzed plane wave solutions having this property; he also analyzed solutions with cylindrical symmetry having this property.
caption: Memorial in Cuxhaven
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