"Hertzian wireless telegraphy" is a book by the famous scientist Sir John Ambrose Fleming, which is devoted to the study of wireless telegraphy and the explanation of the phenomenon underlying it - Hertzian waves. In this book, the author examines the history of the development of wireless communication, describes the principles and techniques of wireless signal transmission, and shares his research in this field. This book will be a useful source of information for anyone interested in wireless communication technologies and the history of the development of telecommunication technologies.