Relativity: The Special and General Theory by Albert Einstein. Translated into English by Robert W. Lawson. Published by Henry Hold and Company. New York, 1920. First edition published in America.
In this work, Einstein explains the fundamentals of his theory that interrelated special relativity and general relativity. The book was published at the height of the productivity and fame of this noted scientist, about a year before he was awarded the Nobel Prize and two years after Einstein's predicton regarding general relativity was confirmed. He predicted that a ray of light passing a mass would bent towards the mass. This prediction was confirmed by a royal London delgation headed by British Physicist Sir Arthur Stanley Eddington who watched and photographed a solar eclipse.  This book was printed a year earlier in London. This is the first edition that was printed in America.
Einstein was one of the greatest physicists of all time and one of the most prominent theoreticians, along with Isaac Newton. The theories of relativity that he developed and explained in this book changed everything that had been previously known about time, space, mass, movement and gravity. His contribution to quantum mechanics, statistical mechanics and the photoelectric effect earned him the Nobel Prize in physics in 1921.
168 [2] XI pages.
Portrait of Einstein signed in the plate at the start of the book. The book is full of equations. Without the paper jacket. Original binding with gilt title.
Very fine condition.