Book excerpt: "Gas and Petroleum Engines" by H. de Graffigny As a French author, Graffigny takes his expertise with words and turns it towards the non-fiction realm. Written at a time when internal combustion motors were beginning to gain popularity, he wished to educate the general population about different types of engines and their importance. Discussing everything from the descriptions of current engines to the maintenance needed to keep them going, and accompanied by illustrations, the book is a useful tool that captures a moment in motor history.