Einstein (Albert) Relativity. The Special & General Theory, translated by Robert W.Lawson, first edition in English, half-title, portrait frontispiece, diagrams and equations in text, 8pp. publisher's catalogue at end, very light spotting to head of first few leaves, browning to endpapers, original red cloth, light fading to spine, a couple of small marks to upper cover, corners very slightly bumped, a good copy preserved in modern cloth drop-back box, [cf. PMM 408, first edition], 8vo, 1920.

⁂ The first English edition of one of the most influential scientific works of the 20th century. First published in Germany in 1916, this translation is of the third German edition of 1918 but contains an additional section: Appendix III 'The Experimental Confirmation of the General Theory of Relativity'.
"The theory of relativity has transformed astrophysics, and indeed the whole scientific outlook." PMM.