
The SciencesJuly 1, 1939
Relativity--20 Years After
An Evaluation of the Achievements of the Special and General Theories of Relativity During the 20 Years which Have Elapsed since the First Direct Observational Test of the General Theory

Relativity--20 Years After
An Evaluation of the Achievements of the Special and General Theories of Relativity During the 20 Years which Have Elapsed since the First Direct Observational Test of the General Theory