"Gas and Petroleum Engines" by H. de Graffigny is a scientific publication written in the late 19th century. This work delves into the history, development, and working principles of gas and petroleum engines, providing insights into the evolution of internal combustion motors. The book is intended for both technical and non-technical readers, aiming to demystify the subject and highlight the significance of these engines in modern industry. At the start of the book, the editor presents a preface that sets the tone for the exploration of internal combustion technologies, emphasizing their burgeoning importance over traditional horse-drawn vehicles. The beginning of the first chapter outlines the historical timeline of gas engine inventions, tracing back to early concepts from the 17th century through notable advancements made up to the 1860s. It introduces key inventions and inventors, providing a foundational context for the development of modern gas engines, and hints at a later discussion of theories and practical applications that will follow in the text. (This is an automatically generated summary.)