Significant handwritten calculations in pencil by Albert Einstein, one page, 8 x 10, for his 1941 paper 'On the Five-Dimensional Representation of Gravitation and Electricity,' which appeared in the Theodore von Karman Anniversary Volume published by the California Institute of Technology. Written by Einstein with his assistants Peter Bergmann and Valentine Bargmann, the published paper relies on the Kaluza-Klein theory in the search for a unified field theory. It is a modification of his theory based on making the fifth dimension in the theory physically real, but bound up so small that we do not observe it. The boxed equation at the top of this page is Equation 18 of the paper, assuming Einstein's deltas on the page refer to time derivatives, which seems reasonable. The phrase "vanishing of the space" [translated from German] may refer to conditions which make the extra dimension disappear, and the line "man soll bewissen…" seems to be the same as the condition on Page 216 of the paper for which Einstein reduces the normal Kaluza theory. Einstein uses Greek indices rather than Latin, to indicate 5 rather than 4 dimensions. The page is annotated on the reverse: "Work of Albert Einstein, done weekend that he spent in our home in Old Field South with his sister, and Mrs. Rita Konenkov & Bishops. Summer of 1941—while we were west. U. Fuller, Setauket, L.I. N.Y." In fine condition, with intersecting folds and some light creases.During the summer of 1941, Einstein and his sister Maja stayed at the home of Mrs. and Mrs. Daniel Fuller on Long Island, where he visited with Marjorie Bishop and Rita Konenkov, the wife of Russian sculptor Sergei Konenkov. Bishop recalls his stay in her essay 'Our Neighbors on Eighth Street, 1935–1945,' published in The Uncommon Vision of Sergei Konenkov: '[Einstein] was simply marvelous, and we've still got a couple of things that he'd worked out and left on the table. He told us that he'd worked out one of the problems that he'd been working on for a long time in the peace and quiet of the garden.' Einstein spent much of his later years in the search for a unified field theory, and it is a subject that continues to be pursued by theoretical physicists today.Format: Handwritten Calculations