London: The London Times, 1919. 1st Edition. FIRST EDITION. “Writing at the request of the Times, Einstein expressed his appreciation to England and English scientists for sparing no expense in testing his theory, ‘which was perfected and published during the war in the land of your enemies.’ He also discussed various theories and principles in physics as they apply to the theory of relativity” (Calaprice, The Einstein Almanac, 80).
In 1916 Einstein proposed three tests of general relativity. In the gratitude to English scientists in the letter offered here, he notes: "The chief attraction of the theory lies in its logical completeness. If a single one of the conclusions drawn from it proves wrong, it must be given up; to modify it without destroying the whole structure seems to be impossible" (Time, Space, and Gravitation, 1919). Item #1438
CONDITION & DETAILS: Full issue of the paper, November 28th, 1919. The issue, lightly toned with slight fingering at the margin, is housed in an archival slipcase. Very good condition.