This manual, first published in 1943, has been absolutely indispensable to ship's engineers for generations. The third edition, revised and updated by a team of marine engineers/professors, follows in the venerable style of its predecessors. Text relating to obsolete equipment has been eliminated; information on systems that are still current has been updated; and new material has been added to reflect innovations in equipment and operative practices. Extensive coverage on the newest medium-speed diesel engine has been added to the text. Environmental concerns have been recognized with a section on engine exhaust emissions as well as information about new refrigerants and the maintenance of refrigeration systems. New equipment for trash handling, sewage processing, bilge water discharge, and incineration is discussed with reference to international regulations. Ship trial procedures and the new equipment used in trial data collection are presented in detail.