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  The California earthquake of April 18, 1906 : report of the State Earthquake Investigation Commission, in two volumes and atlas.
 
    Acknowledgements
    Foreword
    Introduction
    Preface
    Introduction

  expand section The California Earthquake of April 18, 1906  Volume I, Part I
  expand section The California Earthquake of April 18, 1906  Volume I, Part II
  expand section The California Earthquake of April 18, 1906  Volume II

  collapse section Appendix  Theory of the Seismograph
    Introduction
    Rotations Due to Earth Waves
    Forms of Seismographs
    Registration
    The Mathematical Theory
  expand section The Horizontal Pendulum
    The Vertical Pendulum
    The Inverted Pendulum
    Seismographs For Vertical Movements
    Separation of Linear Displacements and Tilts
    Useful FormulÅ“