‎"EDDINGTON, A. S.‎
‎A Comparison of Whitehead's and Einstein's Formulae. - [INTRODUCING THE ""EDDINGTON""-COORDINATES]‎

‎London, Macmillan & Co., 1924. Royal8vo. In the publisher's pictorial cloth. Gilt lettering and Nature's logo to spines and front board. In ""Nature"", January - June, 1924, Vol. 113. Entire volume offered. Slight wear to extremities, otherwise a fine and clean copy. Rare in the publisher's binding. P. 192 [Entire volume: (2), 948, III-LVII pp.].‎

Reference : 47053

‎First printing of this important paper which constitutes the original treatments of the Schwarzschild solution of Einstein's gravitational field equations (now known as a black hole), there was an apparent singularity at the Schwarzschild radius (now known as the event horizon). In this paper Eddington introduces a new coordinate system that is non-singular at the event horizon, showing that this is not a true singularity. The coordinates were rediscovered by Finkelstein in 1958.‎