André Blondel
(28 August 1863 – 15 November 1938)
André-Eugène Blondel was a French engineer and physicist. He is the inventor of the electromechanical oscillograph and the system of photometric units of measurement.Blondel was born in Chaumont, Haute-Marne, France. He was employed as an engineer by the Lighthouses and Beacons Service until he retired in 1927 as its general first class inspector. He became a professor of electro technology at the School of Bridges and Highways and the School of Mines in Paris. Very early in his career he suffered immobility due to a paralysis of his legs, which confined him to his room for 27 years, but he never stopped working.
In 1899, he published Empirical Theory of Synchronous Generators which contained the basic theory of the two armature reactions (direct and transverse).
Blondel invented the bifilar and soft iron oscillographs. These instruments won the grand prize at the St. Louis Exposition in 1904. He built a theory of rectification with asymmetrical electrodes. In 1892, he published a study on the coupling of synchronous generators.
In 1894 he proposed the lumen and other new measurement units for use in photometry, based on the metre and the Violle candle. He coined the names of the phot and the stilb around 1920.
Blondel was made a life member of the French Academy of Sciences in 1913. He was appointed commander of the Légion d'honneur in 1927, and was awarded the Faraday Medal in 1937. He also received the medal of the Franklin Institute, the Montefiore award and Lord Kelvin award.
0 comentários:
Post a Comment