K. Ferdinand Braun

Karl Ferdinand Braun was a physicist whose work in the laboratory became the invisible backbone of modern life. Born in Fulda, Germany, he was a professor who preferred the tangible puzzles of applied physics to abstract theory. His breakthrough came in 1897 with the creation of the first cathode-ray tube, a glowing glass vessel that would one day become the television screen. But his mind was restless; he also pioneered a new, more efficient method of wireless telegraphy, using a closed oscillation circuit that allowed signals to travel farther and clearer, a contribution that earned him a shared Nobel Prize with Marconi in 1909. Later, his concept of directing radio waves with an array of antennas laid the groundwork for radar. Braun died in the United States, where he had been detained during World War I while defending his radio patents, a testament to the global importance of his inventions.