Relativity: The Special & the General Theory / A Popular Exposition, 3rd ed.

THE SPECIAL & THE GENERAL THEORY
A POPULAR EXPOSITION
BY
ALBERT EINSTEIN, Ph.D.
PROFESSOR OF PHYSICS IN THE UNIVERSITY OF BERLIN
AUTHORISED TRANSLATION BY
ROBERT W. LAWSON, D.Sc.
UNIVERSITY OF SHEFFIELD
WITH FIVE DIAGRAMS AND A PORTRAIT OF THE AUTHOR
THIRD EDITION
METHUEN & CO. LTD. 36 ESSEX STREET W.C. LONDON
This Translation was first Published August 19th 1920 Second Edition September 1920 Third Edition 1920