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Preface to the
Fourth Edition
This book first appeared in 1925. The basic principles of
relativity have not changed since then, but both the theory
and its applications have been much extended, and some
revision has been necessary for the second and subsequent
editions. For the second and third editions I carried out these
revisions with Bertrand Russell's approval. The revisions for
this fourth edition are entirely my responsibility. I have again
altered a number of passages to agree with present knowledge
or opinion, and I have attempted to eliminate the possessive
case, as applied to laws or theories, where it seemed to me
no longer appropriate.
I have also done my best to renounce the convention that
the masculine includes the feminine. Sixty years ago this may
have been acceptable, or at least tolerated; now it is no longer
so,'and I have little doubt that Russell, who was a pro-feminist
ahead of his time, would have approved of the renunciation.
I have not presumed to meddle with the substance of the
last two chapters, which are largely philosophical, rather than
physical, in character, although there is much in them which
I disagree with.
P.P.
Fourth Edition
This book first appeared in 1925. The basic principles of
relativity have not changed since then, but both the theory
and its applications have been much extended, and some
revision has been necessary for the second and subsequent
editions. For the second and third editions I carried out these
revisions with Bertrand Russell's approval. The revisions for
this fourth edition are entirely my responsibility. I have again
altered a number of passages to agree with present knowledge
or opinion, and I have attempted to eliminate the possessive
case, as applied to laws or theories, where it seemed to me
no longer appropriate.
I have also done my best to renounce the convention that
the masculine includes the feminine. Sixty years ago this may
have been acceptable, or at least tolerated; now it is no longer
so,'and I have little doubt that Russell, who was a pro-feminist
ahead of his time, would have approved of the renunciation.
I have not presumed to meddle with the substance of the
last two chapters, which are largely philosophical, rather than
physical, in character, although there is much in them which
I disagree with.
P.P.
Contents
Preface to the Fourth Edition page 5
1 Touch and Sight: The Earth and the Heavens 9
2 What Happens and What is Observed 17
3 The Velocity of Light 26
4 Clocks and Foot-rules 34
5 Space-Time 45
6 The Special Theory of Relativity 53
7 Intervals in Space-Time 66
8 Einstein's Law of Gravitation 78
9 Proofs of Einstein's Law of Gravitation 91
10 Mass, Momentum, Energy, and Action 100
11 The Expanding Universe 113
12 Conventions and Natural Laws 124
13 The Abolition of'Force' 133
14 What is Matter? 141
15 Philosophical Consequences 148
Preface to the Fourth Edition page 5
1 Touch and Sight: The Earth and the Heavens 9
2 What Happens and What is Observed 17
3 The Velocity of Light 26
4 Clocks and Foot-rules 34
5 Space-Time 45
6 The Special Theory of Relativity 53
7 Intervals in Space-Time 66
8 Einstein's Law of Gravitation 78
9 Proofs of Einstein's Law of Gravitation 91
10 Mass, Momentum, Energy, and Action 100
11 The Expanding Universe 113
12 Conventions and Natural Laws 124
13 The Abolition of'Force' 133
14 What is Matter? 141
15 Philosophical Consequences 148
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