Albert Einstein The Theory of Relativity The special and the General Theory. A popular exposition. Translated by Robert W. Lawson Published By : Methuen & Co. Ltd, London, 1920. First edition, First printing Albert Einstein's theory of relativity is a scientific theory that describes the relationship between space, time, and energy. It includes the special and general theories of relativity. Einstein published his special theory of relativity in 1905. It states that the speed of light is constant and that the laws of physics are the same in all inertial reference frames. It also states that time is relative, meaning that the rate at which time passes depends on your frame of reference. The theory includes the equation E=mc2, which states that energy is equal to mass multiplied by the speed of light squared. Condition : 1920. First edition, First printing Portrait frontis and five line diagrams within the text. Original red cloth boards with faded spine, light wear and spotting. Bumped corner of front board. Page browning with spotting throughout. Ex. Campion hall, Oxford library. Generally clean contents and wear in good condition. Complete with the 8pp publishers adverts at back of book. 138 pp with 8 pages of advertisements. Dimension : 19.5 x 13.0 cm. Photos supplement descriptions. "Please View & Used the photos for Part of Description & Further Condition Details"!!! Ship tracked & Insured.