R.V. Latham, Introduction. Part I-Basic Concepts: The Pure Vacuum Gap: R.V. Latham, The Operational Characteristics of Practical HV Gaps. R.V. Latham, Diagnostic Studies of Prebreakdown Electron Pin-Holes. N.S. Xu, The Physical Origin of Prebreakdown Electron Pin-Holes. N.S. Xu and R.V. Latham, Electron Emission Based Breakdown Mechanisms. R.V. Latham, The Point-Plane Field Emitting Diode. R.V. Latham, Microparticle Phenomena. The Bridged Vacuum Gap: H.C. Miller, High Voltage Performance Characteristics of Solid Insulators in Vacuum. G. Blaise and C. Le Gressus, Charge Trapping-Detrapping Processes and Related Breakdown Phenomena. Part II-TechnologicalPractice: A. Maitland, Pulsed Power. A.J. Durand and A.M. Schroff, High Voltage Breakdown in the Electron Gun of Linear Microwave Tubes. H. Padamsee, RF Superconducting Accelerating Cavities. M.F. Rose, HV Insulation in Space-based Device Applications. B. Mazurek, High Voltage Vacuum Insulation at Cryogenic Temperatures. B. GA. Juttner, Vacuum Arc Initiation and Applications. Subject Index.