Third edition, with a foreword by Sir Edmund Whittaker. Oliver Heaviside continued active scientific work for more than twenty years after the publication of the third volume of his Electromagnetic Theory. His unpublished notes, some of which were found in 1957, contained many discoveries: the ways in which Heaviside's ideas developed during those twenty years is included in two lengthy appendices in this 1971 edition.

Table of Contents

• Introduction
• Outline of the electromagnetic connections
• Appendix A
• The elements of vectorial algebra and analysis
• Theory of plane electromagnetic waves
• Appendix B
• Appendix B\(^\prime\)

• Mathematics and the age of the earth
• Pure diffusion of electric displacement
• Appendix C
• Electromagnetic waves and generalised differentiation
• Generalised differentiation and divergent series
• Appendix D
• Appendix E
• Appendix F
• Appendix G
• Appendix H
• Appendix I
• Notes

• Waves from moving sources
• Appendix J
• Appendix K
• Waves in the ether
• Some unpublished notes of Oliver Heaviside
• The Heaviside papers found at Paignton