A set of four volumes designed to give the layman an understanding of how things work, from the simplest mechanical functions of modern life to the most basic scientific principles and complex industrial processes that affect our well-being. Volume III includes: Aerosols, Nuclear Reactors, Sulphuric Acid, Deep-drilling Engineering, Preparation of Ores, Metal Casting, Forging, Pressure Welding, Screw Threads, Gears, Lathe, Clutches, Guns, Fuses, Mines, Torpedoes, Tanks, Fuel Injection, ... and so much more.