This monograph describes methods for deriving wind speed and stream direction from measurements of pressures in the flow, and for determining certain of these pressures (such as free-stream static and total pressure) in their own right. Details of the design and construction of various instruments are given, as well as their general principles and practical performance. Whilst the bulk of the information relates to incompressible and subsonic compressible flow, supersonic flow also is discussed where appropriate.

Separate chapters are devoted to the measurement of total pressure and temperature (Chapter 2), static pressure (Chapter 3). stream velocity (Chapter 4), and flow direction (Chapter 5). These are followed by a discussion of 'combination-type' instruments which embody means for determining several or all of these quantities at the same time (Chapter 6). Constructional details are described in Chapter 7.

Orientation and traversing apparatus is needed in the use of some of the instruments; various designs are described in Chapter 8. For the measurement of the pressures themselves a great variety of manometers is available, of both liquid-level and electrical-transducer types; these also are discussed (Chapter 9).

It is hoped that this monograph will thus provjde a practical handbook of current practice as well as a definitive account of basic principles: the present state of the art seems well suited to the former, and the latter should change little with time.