Pierre Idrac

from Wikipedia, the free encyclopedia

Pierre Idrac (also often Paul , Peter ) (born February 14, 1885 in Paris , † June 17, 1935 ) was a French meteorologist.

Life

The son of the sculptor Jean-Antoine-Marie Idrac and nephew of the architect Albert Ballu attended the École polytechnique and became research director of the elite school Mines ParisTech . He accompanied Jean-Baptiste Charcot on his expeditions. After meeting Henry Bénard in 1916 , he began investigating vortex rolls and cloud streets . He studied vertical currents and came up with the idea of ​​explaining the spatial periodicity of the updrafts and downdrafts over a wide plane.

When wind tunnel measurements appeared, he used pennants attached to a kite wire as an indicator of the flow field. The specific weight tendency of the pennants was previously determined as a function of the wind speed in the flow channel and was used as a corrective for the actual measurements in the free atmosphere. After the war he used cinematographic processes. On various expeditions to the tropics, he filmed the gliding of albatrosses, petrels and even flying fish. For years, the chronophotographic knowledge he derived from this formed one of the essential foundations in the Rhön-Rossitten Society's search for the secret of thermal gliding. In Africa in 1919 he registered wind fluctuations and inclinations with the help of kites and pilot balloons. His investigation confirmed that the gliding observed by Ernest Hanbury Hankin was actually due to thermal air currents. 1923-1924 the government sent him with transport ships and whalers to Argentina and South Georgia to study the aerodynamics of the glider flight of albatrosses on the sea.

In 1927 he made the first attempts at radiosondes with Robert Bureau , which marked the beginning of systematic research into the vertical dimension of the atmosphere.

Publications

  • Soaring Flight in Guinea ; 1920
  • Études expérimentales sur le vol à voile ; 1921 (Thèse de doctorat, Paris)
  • Étude sur les conditions d'ascendance du vent favorable au vol à voile ; 1923
  • Études expérimentales sur le vol à voile au lieu même d'évolution des grands oiseaux voiliers (vauturs, albatros, etc.) ; 1931
  • Experimental studies on gliding in the middle of the flight area of ​​large sailing birds (vultures, albatross, etc.). Their application to soaring in humans. ; 1932 (translated by Fritz Höhndorf)
  • Le nouvel enregistreur de courants sous-marins de M. Pierre Idrac: les premiers résultats qu'il a permis d'obtenir en Océanographie ; 1931
  • Thermographe enregistreur Idrac de haute précision pour les observations océanographiques sous-Marines ; 1933
  • Appareil Idrac pour la mesure de courants verticaux sous-marins ; 1933
  • New enregistreur de vitesse et direction pour courants sous-marins ; 1928
  • Recherches sur le champ électrique de l'atmosphere aux grandes altitudes à l'observatoire de Trappes ; 1928

Web links

Individual evidence

  1. ↑ http://edoc.hu-berlin.de/ilinx/1/rosol-christoph-71/PDF/rosol.pdf
  2. ↑ http://www.radiosonde.eu/RS01/RS01C40.html
personal data
SURNAME Idrac, Pierre
BRIEF DESCRIPTION French meteorologist
DATE OF BIRTH February 14, 1885
PLACE OF BIRTH Paris
DATE OF DEATH June 17, 1935