Excerpt from Relativity: The Electron Theory and Gravitation
The first edition of this book was published while the General Principle of Relativity was being worked out, before it seemed possible to arrive at any confirmation from observation. Shortly after, however, it was shown that the new theory explained the motion of the perihelion of Mercury, and now the result of the Solar Eclipse expedition has clinched matters.
It seemed best to leave practically untouched the account of the special principle as the natural avenue of approach to the broader view, which is described at length in Part II.
Acknowledgment is due to the authors friends, Prof. H. F. Baker and Mr. E. V. Appleton, who kindly read through the proofs of the new matter.
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