This work deals with the results of measurements of almost all kinds of physical quantity. It discusses the form in which these results are expressed and used; how account can, indeed must be taken of their inevitable imperfections; and how relations connecting them may not only be cast in the most concise and general form but, to some extent, predicted by dimensional analysis. All the main techniques of dimensional analysis are here, for the first time, included in one volume. The treatment of the various topics is unified by the concept of physical algebra in which a letter symbol in general represents a number and a unit together. The latest definitions and conventions relating to SI units are included, although Imperial units, still in wide use, are by no means overlooked. The handling of experimental data by graphical and numerical techniques is considered with the minimum of mathematical complication, and many common misunderstandings, particularly in regard to angular measure, are corrected with the uncommon clarity that is characteristic of the entire book.
The discussion of dimensional analysis incorporates a simple yet little-known step-by-step technique which, by neatly closing loopholes in earlier methods is, the author believes, by far the best for practical use.