This book describes, with detailed diagrams and illustrations, the main technical developments across a 500-year timespan, from the beginnings in Germany and France, through the golden age of English horology in the 18th century, to the development of modern factory production in America and Switzerland. It also sets out to give the general reader and collector a grasp of the key technological developments in watch and sets the lives of the inventors and artisans in the context of the social and economic history of their times.