The purpose of this authoritative and internationally accepted handbook is to provide clear explanations of the operating principles and associated systems needed for flight handling and navigation, and for monitoring the performance of aircraft power plants. In updating and revising for this second edition, the author has taken the opportunity to expand his original treatment of some devices, such as the gyroscope and synchronous transmission systems to introduce representative example of new developments, and to incorporate tables of physical data basic to the operation of certain types of instruments.