In “Gas-Engines and Producer-Gas Plants,” Rodolphe Edgard Mathot offers a comprehensive examination of the technical principles and applications of gas engines, intricately detailing their operational dynamics and efficiency aspects. The work melds theoretical insights with practical methodologies, reflecting a meticulous literary style that caters to both engineers and scholars. Mathot contextualizes the evolution of producer gas technology within the broader framework of early 20th-century energy developments, highlighting its significance during a transformative era in industrial engineering, characterized by the transition from steam to gas-powered technologies. Rodolphe Edgard Mathot, an influential figure in the field of mechanical engineering and energy systems, drew upon his extensive expertise and professional experiences to craft this seminal work. His background in engineering, coupled with a fascination for alternative energy solutions, led him to explore the potential of gas engines as a sustainable energy source. Mathot's scholarly pursuits are evident throughout the text, where he integrates historical context with future implications, underscoring his commitment to advancing understanding in energy conversion technologies. This book is highly recommended for engineers, researchers, and historians interested in energy technologies and their evolution. Mathot's insightful analysis and clear exposition not only serve as a pivotal resource for practitioners in the field but also as an essential reference for those who wish to comprehend the historical underpinnings and future possibilities of gas engines and producer-gas applications.