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Karl Ferdinand Braun
 
 
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BiographyBraun was educated at the University of Marburg and received a Ph.D from the University of Berlin in 1872. In 1874 he discovered that a point-contact semiconductorSemiconductor

A semiconductor is a material with electrical conductivity that is intermediate between that of an insulator and a conducto...
 rectifiesRectifier

A rectifier is an electrical device, comprising one or more semiconductive devices or vacuum tubes arranged for converting ...
 alternating currentAlternating current

An alternating current is an electrical current whose magnitude and direction vary cyclically, as opposed to direct current...
. He became director of the Physical Institute and professor of physicsPhysics

Physics , the most fundamental physical science, is concerned with the underlying principles of the natural world....
 at the University of StrasbourgUniversity of Strasbourg

The University of Strasbourg in Strasbourg, Alsace, France, is divided into three separate institutions....
 in 1895.

In 1897 he built the first cathode-ray tubeCathode ray tube

The cathode ray tube or CRT, invented by German physicist Karl Ferdinand Braun, is the display device that was long us...
 oscilloscopeOscilloscope

An oscilloscope is a piece of electronic test equipment that allows signal voltages to be viewed, usually as a two-dimensio...
. CRT technology is only now, over a century later, gradually being replaced by flat screen technologies (such as LCD, LED and Plasma) on television sets and computer monitors. The CRTCathode ray tube Summary

The cathode ray tube or CRT, invented by German physicist Karl Ferdinand Braun, is the display device that was long us...
 is still called the "Braun tube" (Braunsche Röhre) in GermanGerman language

German is a West Germanic language....
-speaking countries (and in Japan: Buraun-kan).


During the development of radioHistory of radio

The pre- and early history of radio is the history of technology that produced instruments that use radio waves....
, he also worked on wirelessWireless

Wireless is an old-fashioned term for a radio transceiver, referring to its use in wireless telegraphy early on, or for a ra...
 telegraphyTelegraphy

Telegraphy is the long-distance transmission of written messages without physical transport of letters, originally by chang...
.






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Timeline

1850   Born

1918   Died





Encyclopedia


Biography

Braun was educated at the University of Marburg and received a Ph.D from the University of Berlin in 1872. In 1874 he discovered that a point-contact semiconductorSemiconductor

A semiconductor is a material with electrical conductivity that is intermediate between that of an insulator and a conducto...
 rectifiesRectifier

A rectifier is an electrical device, comprising one or more semiconductive devices or vacuum tubes arranged for converting ...
 alternating currentAlternating current

An alternating current is an electrical current whose magnitude and direction vary cyclically, as opposed to direct current...
. He became director of the Physical Institute and professor of physicsPhysics

Physics , the most fundamental physical science, is concerned with the underlying principles of the natural world....
 at the University of StrasbourgUniversity of Strasbourg

The University of Strasbourg in Strasbourg, Alsace, France, is divided into three separate institutions....
 in 1895.

In 1897 he built the first cathode-ray tubeCathode ray tube

The cathode ray tube or CRT, invented by German physicist Karl Ferdinand Braun, is the display device that was long us...
 oscilloscopeOscilloscope

An oscilloscope is a piece of electronic test equipment that allows signal voltages to be viewed, usually as a two-dimensio...
. CRT technology is only now, over a century later, gradually being replaced by flat screen technologies (such as LCD, LED and Plasma) on television sets and computer monitors. The CRTCathode ray tube Summary

The cathode ray tube or CRT, invented by German physicist Karl Ferdinand Braun, is the display device that was long us...
 is still called the "Braun tube" (Braunsche Röhre) in GermanGerman language

German is a West Germanic language....
-speaking countries (and in Japan: Buraun-kan).


During the development of radioHistory of radio

The pre- and early history of radio is the history of technology that produced instruments that use radio waves....
, he also worked on wirelessWireless

Wireless is an old-fashioned term for a radio transceiver, referring to its use in wireless telegraphy early on, or for a ra...
 telegraphyTelegraphy

Telegraphy is the long-distance transmission of written messages without physical transport of letters, originally by chang...
. Around 1898, he invented a crystal diode rectifierDiode

In electronics, a diode is a component that restricts the direction of movement of charge carriers....
 or Cat's whisker diodeCat's whisker diode

A cat's whisker is the tiny wire that connects to the detector in a crystal radio....
. Guglielmo MarconiGuglielmo Marconi Overview

Although Guglielmo Marconi is widely credited as the "Inventor of Radio", for some this title is controversial, and compet...
 used Braun's patents (among others). Braun's British patent on tuning was used by Marconi in many of his tuning patents. Marconi would later admit to Braun himself that he had "borrowed" portions of Braun's work. In 1909 Braun shared the Nobel PrizeNobel Prize Overview

The Nobel Prizes are prizes instituted by the will of Alfred Nobel, awarded to people who have done outstanding research, i...
 for physics with Marconi for "contributions to the development of wireless telegraphy."

Braun went to the United States at the beginning of World War IWorld War I

World War I, also known as the First World War, the Great War and "The War to End All Wars" was a global m...
 to help defend the German wireless station at Sayville, N.Y. (on Long IslandLong Island

Jer's Island is an island in New York, USA....
) against attacks by the British controlled Marconi Corporation. (At this time the U.S. had not yet entered the war). Braun died in his house in BrooklynBrooklyn Summary

Brooklyn is one of the five boroughs of New York City....
 before the war ended in 1918.

See also

  • RadioRadio

    Radio is the wireless transmission of signals, by modulation of electromagnetic waves with frequencies below those of light....
    : History of radioHistory of radio

    The pre- and early history of radio is the history of technology that produced instruments that use radio waves....
    , Invention of radioInvention Of Radio

    This is longer information about some of the pioneers of development of radio....
  • People: Edouard BranlyEdouard Branly

    Eugne Édouard Dsir Branly was a French inventor and physicist....