The following sections of this BookRags Literature Study Guide is offprint from Gale's For Students Series: Presenting Analysis, Context, and Criticism on Commonly Studied Works: Introduction, Author Biography, Plot Summary, Characters, Themes, Style, Historical Context, Critical Overview, Criticism and Critical Essays, Media Adaptations, Topics for Further Study, Compare & Contrast, What Do I Read Next?, For Further Study, and Sources.
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The following sections, if they exist, are offprint from Beacham's Guide to Literature for Young Adults: "About the Author", "Overview", "Setting", "Literary Qualities", "Social Sensitivity", "Topics for Discussion", "Ideas for Reports and Papers". (c)1994-2005, by Walton Beacham.
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1872-1946
French physicist best known for establishing the modern theory of magnetism. Langevin explained paramagnetism and diamagnetism in terms of interactions between magnetic fields induced by orbiting electrons and external magnetic forces. He showed how to slow down neutrons, which proved essential for later work on atomic reactors. He is important for introducing and explaining Albert Einstein's theory of relativity to the French scientific community. His echolocation technique for detecting submarines was the basis for sonar.