The book "The Telephone: A Lecture entitled Researches in Electrotelephony" by eminent inventor and scientist Alexander Graham Bell reveals the unique research that led to the creation of the telephone. In his lecture, the author describes in detail the discovery and principles of operation of the first electric telephone, reveals the principles of sound transmission over wires, and will also share his further ideas about the future of this invention. This book is not only a valuable document for the history of technology, but also inspires readers to research and create in the field of communication technology.