## ABC of RelativityPsychology Press, 1997 - 155 pages Ask a dozen people to name a genius and the odds are that 'Einstein' will spring to their lips. Ask them the meaning of 'relativity' and few of them will be able to tell you what it is. The basic principles of relativity have not changed since Russell first published his lucid guide for the general reader. The ABC of Relativityis Bertrand Russell's most brilliant work of scientific popularisation. With marvellous lucidity he steers the reader who has no knowledge of maths or physics through the subtleties of Einstein's thinking. In easy, assimilable steps, he explains the theories of special and general relativity and describes their practical application to, amongst much else, discoveries about gravitation and the invention of the hydrogen bomb. |

### Contents

The Earth and the Heavens | 9 |

What Happens and What is Observed | 17 |

The Velocity of Light | 26 |

Clocks and Footrules | 35 |

SpaceTime | 45 |

The Special Theory of Relativity | 66 |

Einsteins Law of Gravitation | 78 |

Proofs of Einsteins Law of Gravitation | 91 |

Mass Momentum Energy and Action | 100 |

The Expanding Universe | 113 |

Conventions and Natural Laws | 124 |

The Abolition of Force | 133 |

What is Matter? | 141 |

Philosophical Consequences | 148 |

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### Common terms and phrases

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