1. Gases / A. Chambers -- 2. Gases in vacuum systems / A. Chambers -- 3. Pumps / B. S. Halliday -- 4. Measurement of pressure / R. K. Fitch and A. Chambers -- 5. Vacuum materials and components / B. S. Halliday -- 6. Cleaning / B. S. Halliday -- 7. Leaks and leak detection / R. K. Fitch and B. S. Halliday -- 8. Systems / B. S. Halliday -- App. A. Maximum evaporation rate from a surface -- App. B. Molecular drag -- App. C. Reynolds' number Re expressed in terms of throughput Q -- App. D. The Knudsen cosine law -- App. E. A derivation of the Knudsen formula for molecular flow through a pipe (equation (2.20)) -- App. F. Analysis of a simple system -- App. G. Systems with distributed volume -- App. H. Specifying and measuring flow -- App. I. The maintenance of vacuum equipment