The book "Søren Hjort: Inventor of the Dynamoelectric Principle" by Sigurd Smith tells about the life and scientific activity of the outstanding Danish scientist Søren Hjort, who is known as the author of one of the key principles of modern electrical engineering. The book reveals not only the technical aspects of the invention of the dynamoelectric principle, but also points to important historical and cultural information about the period. With the help of interesting scientific and historical material, the author reveals the multifaceted personality of the scientist and his important contribution to the development of electrical engineering. Sigurd Smith's book is a detailed and insightful scientific narrative that helps to better understand the significance of Søren Hjort's discovery for modern technology and science.