According to Tesla's lecture prepared for the Institute of Immigrant Welfare (May. 12, 1938), his "Dynamic Theory of Gravity" was one of two far reaching discoveries, which he "...worked out in all details", in the years 1893 and 1894. The 1938 lecture was less than five years before his death.
More complete statements concerning these discoveries can only be gleaned from scattered and sparse sources, because the papers of Tesla are concealed in government vaults for "national security" reasons. When I specifically asked for these papers at the "National Security Research Center" - now the "Robert J. Oppenheimer Research Center" - in 1979, I was denied access because they were classified, even though on that same day I discovered the plans for the hydrogen bomb on an open shelf, and told a Harvard graduate student about it later in the day at a Santa Fe restaurant. The guy went to Los Alamos, copied the plans, and wrote an expose at Harvard.
More complete statements concerning these discoveries can only be gleaned from scattered and sparse sources, because the papers of Tesla are concealed in government vaults for "national security" reasons. When I specifically asked for these papers at the "National Security Research Center" - now the "Robert J. Oppenheimer Research Center" - in 1979, I was denied access because they were classified, even though on that same day I discovered the plans for the hydrogen bomb on an open shelf, and told a Harvard graduate student about it later in the day at a Santa Fe restaurant. The guy went to Los Alamos, copied the plans, and wrote an expose at Harvard.