The title really says it all! If you want to know some history and background information on these oil engines that we all love then this is the book for you! This book has lots of engine history as well as a lot of nice pictures of some large engines. It explains things from thermodynamics to properties of vapor and ignition of fuel. There are many many brands from year 1678 to more modern years covered and talked about. How impressive that engines have come this far in just a few short years! This really is a wealthy source of information! No shop is complete with out one! Great for the beginner to the gas engine world to the advanced person that wants to learn a couple more things! It measures 6" by 8.75" and is 85 pages.