Prince Boris Borisovich Golitsyn (March 2 [O.S. February 18] 1862 in Saint Petersburg – May 17 [O.S. May 4] 1916 near Petrograd) was a prominent Russian physicist who invented the first electromagnetic seismograph in 1906.
 He was one of the founders of modern Seismology.
 In 1911 he was chosen to be the president of the International Seismology Association.
Wilhelm Eduard Weber (] ; 24 October 1804 – 23 June 1891) was a German physicist and, together with Carl Friedrich Gauss, inventor of the first electromagnetic telegraph.
In electricity generation, a generator is a device that converts motive power into electrical power for use in an external circuit.
 Sources of mechanical energy include steam turbines, gas turbines, water turbines, internal combustion engines and even hand cranks.
 The first electromagnetic generator, the Faraday disk, was built in 1831 by British scientist Michael Faraday.
 Generators provide nearly all of the power for electric power grids.
The Göttingen Seven (German: "Göttinger Sieben" ) were a group of seven professors from Göttingen.
 In 1837, they protested against the abolition or alteration of the constitution of the Kingdom of Hanover by Ernest Augustus and refused to swear an oath to the new king of Hanover.
 The company of seven was led by Friedrich Christoph Dahlmann, who himself was one of the key advocates of the unadulterated constitution.
 The other six were the Germanist brothers Wilhelm and Jacob Grimm (famed fairy tale and folk tale writers and storytellers, known together as the Brothers Grimm), jurist Wilhelm Eduard Albrecht, historian Georg Gottfried Gervinus, physicist Wilhelm Eduard Weber, and theologian and orientalist Heinrich Georg August Ewald.
Georg Heinrich August Ewald (16 November 1803 – 4 May 1875) was a German orientalist, Protestant theologian, and Biblical exegete.
 He studied at the University of Göttingen.
 In 1827 he became extraordinary professor there, in 1831 ordinary professor of theology, and in 1835 professor of oriental languages.
 In 1837, as a member of the Göttingen Seven, he lost his position at Göttingen on account of his protest against King Ernest Augustus I of Hanover's abrogation of the liberal constitution, and became professor of theology at the University of Tübingen.
 In 1848, he returned to his old position at Göttingen.
 When Hanover was annexed by Prussia in 1866, Ewald became a defender of the rights of the ex-king.
 Among his chief works are: "Complete Course on the Hebrew Language" (German: "Ausführliches Lehrbuch der hebräischen Sprache" ), "The Poetical Books of the Old Testament" (German: "Die poetischen Bücher des alten Bundes" ), "History of the People of Israel" (German: "Geschichte des Volkes Israel" ), and "Antiquities of the People of Israel" (German: "Die Altertümer des Volkes Israel" ).
 Ewald represented the city of Hanover as a member of the Guelph faction in the North German and German Diets.
Wilhelm Eduard Albrecht (4 March 1800 – 22 May 1876) was a German constitutional lawyer, jurist, and docent.
 Albrecht was most notable as a member of the Göttingen Seven, a group of academics who in 1837 protested against the abrogation of the constitution of the Kingdom of Hanover by Ernest Augustus I.
Dr. Leonard Dunnell Gale (July 25, 1800-October 22, 1883) was a professor of chemistry and mineralogy who helped Samuel Morse develop the electromagnetic telegraph.
David Edward Hughes (16 May 1831 – 22 January 1900), was a British-American inventor, practical experimenter, and professor of music known for his work on the printing telegraph and the microphone.
 He is generally considered to have been born in London but his family moved around that time so he may have been born in Corwen, Wales.
 His family moved to the U.S. while he was a child and he became a professor of music in Kentucky.
 In 1855 he patented a printing telegraph.
 He moved back to London in 1857 and further pursued experimentation and invention, coming up with an improved carbon microphone in 1878.
 In 1879 he identified what seemed to be a new phenomenon during his experiments: sparking in one device could be heard in a separate portable microphone apparatus he had set up.
 It was most probably radio transmissions but this was nine years before electromagnetic radiation was a proven concept and Hughes was convinced by others that his discovery was simply electromagnetic induction.
An electromagnetic reverberation chamber (also known as a reverb chamber (RVC) or mode-stirred chamber (MSC)) is an environment for electromagnetic compatibility (EMC) testing and other electromagnetic investigations.
 Electromagnetic reverberation chambers have been introduced first by H.A. Mendes in 1968.
 A reverberation chamber is screened room with a minimum of absorption of electromagnetic energy.
 Due to the low absorption very high field strength can be achieved with moderate input power.
 A reverberation chamber is a cavity resonator with a high Q factor.
 Thus, the spatial distribution of the electrical and magnetic field strengths is strongly inhomogeneous (standing waves).
 To reduce this inhomogeneity, one or more "tuners" ("stirrers") are used.
 A tuner is a construction with large metallic reflectors that can be moved to different orientations in order to achieve different boundary conditions.
 The "Lowest Usable Frequency" (LUF) of a reverberation chamber depends on the size of the chamber and the design of the tuner.
 Small chambers have a higher LUF than large chambers.
The Abraham–Minkowski controversy is a physics debate concerning electromagnetic momentum within dielectric media.
 Traditionally, it is argued that in the presence of matter the electromagnetic stress-energy tensor by itself is not conserved (divergenceless).
 Only the total stress-energy tensor carries unambiguous physical significance, and how one apportions it between an “electromagnetic” part and a “matter” part depends on context and convenience.
 In other words, the electromagnetic part and the matter part in the total momentum can be arbitrarily distributed as long as the total momentum is kept the same.
 There are two incompatible equations to describe momentum transfer between matter and electromagnetic fields.
 These two equations were first suggested by Hermann Minkowski (1908) and Max Abraham (1909), from which the controversy's name derives.
 Both were claimed to be supported by experimental data.
 Theoretically, it is usually argued that Abraham version of momentum “does indeed represent the true momentum density of electromagnetic fields” for electromagnetic waves,

Question: Who co-invented the first electromagnetic telegraph along with one of the Göttingen Seven?
Answer: Carl Friedrich Gauss