Prominent scientists and engineers taking a tour at RCA wireless station in New Brunswick, NJ, 1921. Left to right: three unidentified men (possibly W.A. Graham, Ernst F.W. Alexanderson, and W.A. Winterbottom), David Sarnoff, Thomas J. Hayden, Ernest J. Berg, S. Benedict, Albert Einstein, John R. Carson (frequently misidentified as Nikola Tesla), Charles Steinmetz, Alfred N. Goldsmith, A. Malsin, Irving Langmuir, […]
Edison’s patent for an electrical indicator, an efficient apparatus for indicating variations of electromotive force in an electric circuit.