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The earliest version of the CRT was known as the "Braun tube", invented by the German physicist Ferdinand Braun in 1897. [13] It was a cold-cathode diode, a modification of the Crookes tube with a phosphor-coated screen. Braun was the first to conceive the use of a CRT as a display device. [14] The Braun tube became the foundation of 20th ...
Braun's original cold-cathode CRT, the Braun tube, 1897. The enduring fame of Ferdinand Braun is largely due to his invention of the cathode-ray tube, which is still commonly referred to as the "Braun tube." Today, the term typically refers to a high-vacuum tube in which an electron beam can be deflected in both horizontal and vertical directions.
Karl Ferdinand Braun invented the CRT oscilloscope as a physics curiosity in 1897, by applying an oscillating signal to electrically charged deflector plates in a phosphor-coated CRT. Braun tubes were laboratory apparatus, using a cold-cathode emitter and very high voltages (on the order of 20,000 to 30,000 volts).
A Tektronix model 475A portable analog oscilloscope, a typical instrument of the late 1970s Oscilloscope cathode-ray tube, the left square-shaped end would be the blue screen in the upper device when built in. Typical display of an analog oscilloscope measuring a sine wave signal with 10 kHz. From the grid inherent to the screen together with ...
Cathode rays are now usually called electron beams. The technology of manipulating electron beams pioneered in these early tubes was applied practically in the design of vacuum tubes, particularly in the invention of the cathode-ray tube (CRT) by Ferdinand Braun in 1897, which was used in television sets and oscilloscopes.
1932 The company introduces its first cathode ray oscilloscope. 1935 A Cossor cathode-ray tube is used in the receiver of the Daventry Experiment for radar research, conducted to investigate the signals produced by reflections off a Heyford bomber of the output of the BBC transmitter at Daventry. 1936 The company sells its first television ...