Handwritten draft of a paragraph on relativity by Albert Einstein, penned on 10 x 4.5 envelope panel addressed to him at the Institute for Advanced Study, Princeton, New Jersey, 10 x 4.5, postmarked June 7, 1948. Writing in German, Einstein pens most of the final paragraph of his article, 'Relativity: Essence of the Theory of Relativity,' published in 1948 in the American People’s Encyclopedia. The passage is translated into English below in another hand: "while it leads to a well-defined theory of the gravitational field it does not determine sufficiently the theory of the total field (which includes the electromagnetic field). The reason for this is the fact that the general field laws are not sufficiently determined by the general principle of relativity alone." In fine condition.
Einstein's theory of relativity—the foundation of modern physics—encompassed his pioneering concepts of special relativity and general relativity, respectively proposed and published in 1905 and 1915. With it came his famed equation, "E = mc2"—the mass-energy relationship—undoubtedly the most well-known equation ever set forth. Nuclear physics had come to the forefront of the public's attention with the advent of the atomic bomb in World War II, and coherent explanations for the layman were few and far between—hence this essay, prepared for a popular encyclopedia. Concluding the article, he implicitly states why he spent so many of his final years searching for a Unified Field Theory.
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