Synthesized answer
The central thesis of Nikola Tesla's text "On Light and Other High Frequency Phenomena" is not explicitly stated in the provided passages. The passages only offer the title of the work and its description, indicating it is a lecture delivered in 1893 before the Franklin Institute and the National Electric Light Association [1].
Therefore, while we know the subject matter concerns light and other high-frequency phenomena, the specific central argument or thesis of the text cannot be determined from the given information.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: ON LIGHT AND OTHER HIGH FREQUENCY PHENOMENA by Nikola Tesla Description: A lecture delivered before the Franklin Institute, Philadelphia, February 1893, and before the National Electric Light Association, St. Louis, March 1893.