
The Ether of Space https://books.google.com/books?id=ycgEAAAAYAAJ&pg=PA13, p. 13
The Ether of Space (1909)
The Physics of Star Trek, HarperPerennial edition (1996), p. 17.
The Ether of Space https://books.google.com/books?id=ycgEAAAAYAAJ&pg=PA13, p. 13
The Ether of Space (1909)
An Outline of Philosophy Ch.15 The Nature of our Knowledge of Physics (1927)
1920s
As quoted by Andrew Norton, Dynamic fields and waves (2000) p. 83.
1940s, "Autobiographical Notes" (1949)
Context: Reflections of this type made it clear to me as long ago as shortly after 1900, i. e., shortly after Planck's trailblazing work, that neither mechanics nor electrodynamics could (except in limiting cases) claim exact validity. By and by I despaired of the possibility of discovering the true laws by means of constructive efforts based on known facts. The longer and the more despairingly I tried, the more I came to the conviction that only the discovery of a universal formal principle could lead us to assured results.... How, then, could such a universal principle be found? After ten years of reflection such a principle resulted from a paradox upon which I had already hit at the age of sixteen: If I pursue a beam of light with the velocity c (velocity of light in a vacuum), I should observe such a beam as a spatially oscillatory electromagnetic field at rest. However, there seems to be no such thing, whether on the bases of experience or according to Maxwell's equations. From the very beginning it appeared to me intuitively clear that, judged from the stand-point of such an observer, everything would have to happen according to the same laws as for an observer who, relative to the earth, was at rest.
Lecture at Kings College (1862) as quoted by F. V. Jones, "The Man Who Paved the Way for Wireless," New Scientist (Nov 1, 1979) p. 348 & Andrey Vyshedskiy, On The Origin Of The Human Mind 2nd edition