Originally published in 1951 and the first English book on the subject, this textbook is aimed at both the specialist and non-specialist alike and provides a thorough and detailed introduction on the principles that underlie the action of automatic controls, servo-mechanisms and regulators. The early chapters provide a solid foundation to the theory of control and are in the most part descriptive, introducing fundamental terminology and explaining the principles, which underlie the operation of all control systems, whilst in the last three chapters more advanced techniques are used to give an account of the methods employed by control engineers. Modern contributions to the theory at the time are included and questions are set at the end of each chapter. Giving a 'historical summary of the main landmarks in the development of control theory', this book will be of value to anyone with an interest in the history of engineering.

This book was first published in 1956 in response to growing concerns about the rise of automation. Whilst many readers would have heard of automation, few would have had a clear idea of what it was, and what consequences would follow in its wake. The purpose of this volume was to illustrate the history and principles of automation, its advantages and limitations, and the social and economic implications of adopting new systems of automatic control.

Symmetry is of interest in two ways, artistic and mathematical. It underlies much scientific thought, playing an important role in chemistry and atomic physics, and a dominant one in crystallography. It is important in architectural and engineering design and particularly in the decorative arts. This book provides a comprehensive account of symmetry in a form acceptable to readers without much detailed mathematical knowledge or experience who nevertheless want to understand the basic principles of the subject. It will be useful in school and other libraries and as preliminary reading for students of crystallography. The treatment is geometrical, which should appeal to art students and to readers whose mathematical interests are that way inclined.