John Bertrand Johnson

John Erik Bertrand Johnson (born Johan Erik Bertrand; October 2, 1887 – November 27, 1970) was a Swedish-born American electrical engineer and physicist. He created the first cathode-ray tube oscilloscope and detailed a fundamental source of random interference with information traveling on wires, now called Johnson–Nyquist noise.

Johan Erik Bertrand was born in Gothenburg, Sweden on October 2, 1887 to the 20-year-old, unmarried Augusta Johansdotte. The family had lived in extreme poverty until his uncle John A. Johnson helped them emigrate to the United States. The younger John emigrated… More on Wikipedia →