[6. The Generalised Principle of Relativity 89-163]
[A. Einstein’s second paper on the Generalised Principle first published in 1916. Translated from the original German by Mr. Satyendranath Bose.]
Transcriber’s Note:
This ebook includes complex mathematical formulas. Some are simple in-line expressions like k = 1 - 1/μ2. They may include special notations such as [=a] for an 'a' with a bar across the top, [.a] for an 'a' with a dot over it, [..a] for an 'a' with two dots over it. Others are more complex “ASCII Art” like this:
l l 2lc 2l
t₁ = ------- + ---------- = ----------- = --- β²
c - u c + u c² - u² c
HISTORICAL INTRODUCTION
Lord Kelvin writing in 1893, in his preface to the English edition of Hertz’s Researches on Electric Waves, says “many workers and many thinkers have helped to build up the nineteenth century school of plenum, one ether for light, heat, electricity, magnetism; and the German and English volumes containing Hertz’s electrical papers, given to the world in the last decade of the century, will be a permanent monument of the splendid consummation now realised.”