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Georges Claude (24 September 1870 – 23 May 1960) was a French engineer and inventor. He is noted for his early work on the industrial liquefaction of air, for the invention and commercialization of neon lighting, and for a large experiment on generating energy by pumping cold seawater up from the depths.[1] He has been considered by some to be "the Edison of France".[2][3] Claude was an active collaborator with the German occupiers of France during the Second World War, for which he was imprisoned in 1945 and stripped of his honors.[1][2][4]

Georges Claude
Georges Claude 1926.jpg
Georges Claude in 1926
Born 24 September 1870
Paris, France
Died 23 May 1960 (aged 89)
Saint-Cloud, France
Known for Claude cycle
Neon lighting
Ocean energy conversion
Awards Leconte Prize (1921)
Scientific career
Fields Engineering


Early careerEdit

Georges Claude studied at the École supérieure de physique et de chimie industrielles de la ville de Paris (ESPCI).[5] He then held several positions. He was an electrical inspector in a cable factory and the laboratory manager in an electric works. He founded and edited a magazine, L'Étincelle Électrique (The Electric Spark); his important friendship with Jacques-Arsène d'Arsonval apparently dates from this time.[6] About 1896, Claude learned of the explosion risk for bottled acetylene, which was used at the time for lighting. Acetylene is explosive when stored under pressure. Claude showed that acetylene dissolved well in acetone, equivalent to storing it under 25 atmospheres of pressure, reduced the risk in handling the gas.[7]

Liquefaction of airEdit

In 1902 Claude devised what is now known as the Claude system for liquifying air.[8] The system enabled the production of industrial quantities of liquid nitrogen, oxygen, and argon; Claude's approach competed successfully with the earlier system of Carl von Linde (1895).[9] Claude and businessman Paul Delorme founded L'Air Liquide, S.A. (Air Liquide), which is presently a large multinational corporation headquartered in Paris, France.

Neon lightingEdit

Gas discharge tube containing neon; "Ne" is the chemical symbol for neon.

Inspired by Geissler tubes and by Daniel McFarlan Moore's invention of a nitrogen-based light (the "Moore tube"), Claude developed neon tube lighting to exploit the neon that was produced as a byproduct of his air liquefaction business.[10] These were all "glow discharge" tubes that generate light when an electric current is passed through the rarefied gas within the tube. Claude's first public demonstration of a large neon light was at the Paris Motor Show (Salon de l'Automobile et du Cycle), 3–18 December 1910.[11][12] Claude's first patent filing for his technologies in France was on 7 March 1910.[13] Claude himself wrote in 1913 that, in addition to a source of neon gas, there were two principal inventions that made neon lighting practicable. First were his methods for purifying the neon (or other inert gases such as argon). Claude developed techniques for purifying the inert gases within a completely sealed glass tube, which distinguished neon tube lighting from the Moore tubes; the latter had a device for replenishing the nitrogen or carbon dioxide gases within the tube. The second invention was ultimately crucial for the development of the Claude lighting business; it was a design for minimizing the degradation (by "sputtering") of the electrodes that transfer electric current from the external power supply to the glowing gases within the sign.[10]

The terms "neon light" and "neon sign" are now often applied to electrical lighting incorporating sealed glass tubes filled with argon, mercury vapor, or other gases instead of neon. In 1915 a U.S. patent was issued to Claude covering the design of the electrodes for neon lights;[14] this patent became the strongest basis for the monopoly held in the U.S. by his company, Claude Neon Lights, through the early 1930s.[15]

In 1923, Georges Claude and his French company Claude Neon, introduced neon gas signs to the United States, by selling two to a Packard car dealership in Los Angeles. Earle C. Anthony purchased the two signs reading "Packard" for $1,250 a piece. Neon lighting quickly became a popular fixture in outdoor advertising. Visible even in daylight, people would stop and stare at the first neon signs for hours, dubbed "liquid fire."[citation needed]

Ocean thermal energy conversionEdit

Georges Claude conducting a demonstration on ocean thermal energy conversion at the Institut de France in 1926.

Claude's mentor and friend was Jacques-Arsène d'Arsonval, the inventor of the "Ocean Thermal Energy Conversion" (OTEC) concept. Claude was also the first person to build prototype plants of that technology. Claude built his plant in Cuba in 1930. The system produced 22 kilowatts of electricity with a low-pressure turbine.[3][16]

In 1935, Claude constructed another plant, this time aboard a 10,000-ton cargo vessel moored off the coast of Brazil. Weather and waves destroyed both plants before they could become net power generators.[16] (Net power is the amount of power generated after subtracting power needed to run the system.)

Wartime collaboration and post-war imprisonmentEdit

Even as a young engineer, Claude was unsympathetic to democratic rule.[6] In 1933 he joined the Action française, which favored restoration of a monarchy in France.[4] He was a close friend of the monarchist leader Charles Maurras.[2] Following the 1940 defeat of France by Germany at the beginning of the Second World War, the subsequent German occupation of northern France and establishment of the Vichy regime in the south, Claude publicly supported French collaboration with Germany. Among his other activities, he published several tracts supporting collaboration.[17][18][19] He was a member of a Distinguished Committee of the Groupe Collaboration, which had been founded in September, 1940. He was nominated by the Vichy regime as a member of the Conseil National Consultatif in 1941.

Following the Allied liberation of France in 1944, Claude was taken into custody on 2 December 1944 because of his collaboration with the Axis Powers. He was removed from the French Academy of Sciences. In 1945 he was tried and convicted of propaganda work favoring collaboration, but was cleared of another charge that he helped design the V-1 flying bomb. He was condemned to life imprisonment, and was imprisoned. In 1950 he was released from prison, with acknowledgment of his research on ocean thermal energy conversion.[1]

Selected bibliographyEdit

Claude wrote several semi-popular descriptions of his research, in addition to his wartime tracts and a memoir.


  1. ^ a b c "Georges Claude, Inventor, Dies; Creator of Neon Light was 89". The New York Times. May 24, 1960. p. 37.  Paid access.
  2. ^ a b c "FRANCE: Paranoia?". Time Magazine. July 9, 1945. 
  3. ^ a b Chiles, James (Winter 2009). "The Other Renewable Energy". Invention and Technology. 23 (4): 24–35. Archived from the original on 2009-12-02. 
  4. ^ a b Venner, Dominique (2000). Histoire de la collaboration [History of the Collaboration] (in French). Pygmalion-Gérard Watelet. ISBN 978-2-85704-642-4. 
  5. ^ "ESPCI ParisTech Alumni 1889". 
  6. ^ a b c Blondel, Christine (1985). "Industrial science as a "show": A case study of Georges Claude". In Shinn, Terry; Whitley, Richard. Expository Science: Forms and Functions of Popularisation. D. Reidel. p. 251. ISBN 978-90-277-1831-0. 
  7. ^ Almqvist, Ebbe (2003). History of industrial gases. Springer. p. 242. ISBN 978-0-306-47277-0. 
  8. ^ Greenwood, Harold Cecil (1919). Industrial Gases. D. Van Nostrand. p. 87. 
  9. ^ Iqbal, S. A. (2005). Physical Chemistry. Discovery Publishing House. p. 42. ISBN 978-81-7141-994-4. 
  10. ^ a b Claude, Georges (November 1913). "The Development of Neon Tubes". The Engineering Magazine: 271–274. 
  11. ^ There is, as yet, no satisfactory primary source to the actual date on which Claude unveiled his neon lights at the 1910 Paris Motor Show. Many references give 3 December 1910, which was the starting date for the show. See Robertson, Patrick (1974). The book of firsts. C. N. Potter.  and also the Motor Show poster. Others give 11 December; see Bloom, Ken (2004). Broadway: its history, people, and places : an encyclopedia. Taylor & Francis. ISBN 978-0-415-93704-7. .
  12. ^ Testelin, Xavier. "Reportage – Il était une fois le néon No. 402" (in French). Retrieved 2010-12-06.  Claude's 1910 demonstration of neon lighting lit the peristyle of the Grand Palais in Paris; this webpage includes a recent photograph that gives an impression of it. It is part of an extensive selection of images of neon lighting; see "Reportage – Il était une fois le néon". 
  13. ^ FR patent 424190, Georges Claude, "Perfectionnements dans l'eclairage par tubes luminescents", issued 1911-03-08 
  14. ^ US 1125476, Georges Claude, "Systems of Illuminating by Luminescent Tubes", issued 1915-01-19  See reproduction of patent.[permanent dead link]
  15. ^ "Claude Neon Lights Wins Injunction Suit: Also Gets Rights to Recover Profits and Damages Resulting From Patent Infringement". The New York Times. November 28, 1928.  Paid access.
  16. ^ a b Takahashi, Masayuki Mac (2000) [1991]. "2. Ocean Water and Its Wonderful Potential" (PDF). Deep Ocean Water as Our Next Natural Resource. Translated by Kitazawa, Kazuhiro; Snowden, Paul. Tokyo, Japan: Terra Scientific Publishing Company. ISBN 4-88704-125-X. 
  17. ^ Claude, Georges (1941). Histoire d'une évolution: de l'hostilité à la collaboration [History of an Evolution: On Hostility Against Collaboration] (in French). Les Éditions de France. 
  18. ^ Claude, Georges (1942). La seule route [The Only Route] (in French). Inter-France. 
  19. ^ Claude, Georges; Vuillermoz, Émile (1943). Français, il faut comprendre! [France! You Must Understand!] (in French). L. Hardy. 
  20. ^ Paxton, Robert O. (1997). French peasant fascism: Henry Dorgère's Greenshirts and the crises of French agriculture, 1929–1939. Oxford University Press. p. 33. ISBN 978-0-19-511189-7. 

Further readingEdit

  • Baillot, Rémy (2010). Georges Claude : Le génie fourvoyé. EDP SCIENCES. ISBN 978-2-7598-0396-5.  The French title translates loosely as Genius Gone Astray; Baillot's appears to be the only book-length biography of Claude.