Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.

This book aims to provide readers with a simple and clear explanation of the working principles and reasons of gas engines or oil engines. The main features and characteristics of these engine structures are described, and the methods and preventive measures required to achieve the desired results are described in detail with limited space.