K. Ferdinand Braun

Karl Ferdinand Braun was a German physicist and inventor who shared the 1909 Nobel Prize in Physics for contributions to wireless telegraphy. He developed the cathode-ray tube and improved radio transmitters.

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Guglielmo Marconi: An Italian inventor who developed practical wireless telegraphy and shared the 1909 Nobel Prize in Physics with Braun. Braun shared the Nobel Prize with Marconi for contributions to wireless telegraphy.
Wireless telegraphy: The transmission of telegraph messages by electromagnetic waves rather than wires. It was the field in which Braun’s transmitter improvements became consequential.
Radio transmitter: A device that generates and radiates electromagnetic signals for communication or other purposes. Braun’s transmitter innovations made radio signals more effective to send.
University of Strasbourg: A French public university in Strasbourg, with roots in an academy founded in 1538. Braun worked in Strasbourg when he developed his cathode-ray tube.
Heinrich Hertz: A German physicist who demonstrated electromagnetic waves and established key evidence for Maxwell’s theory. Hertz’s experiments on electromagnetic waves laid the physical groundwork for Braun’s radio work.
Coupled circuits: Electrical circuits that exchange energy through electromagnetic or direct coupling. Braun’s transmitter design used coupled circuits to improve the generation and tuning of radio signals.
Antenna: A conductor or array that transmits or receives electromagnetic waves. Braun’s coupled transmitter circuits improved the antenna’s role in radiating oscillations.
Cathode rays: Streams of electrons observed in evacuated tubes and studied before the electron’s discovery. Investigations of cathode rays formed the experimental setting for Braun’s tube.
James Clerk Maxwell: A Scottish physicist whose equations describe classical electromagnetism and predict electromagnetic waves. Maxwell’s theory explains the waves that Braun’s transmitters helped put to practical use.
Spark-gap transmitter: A radio transmitter that generates electromagnetic oscillations through repeated electrical sparks. Braun improved spark-based transmission by coupling the spark circuit to an antenna circuit.