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 II includes: Fountain Pen, Gramophone, Juke Box, Glass, Rubber, Timber, Washing Machines, Silk Screen Printing, X-ray, Gunpowder, Radioactivity, Motorcycle, Sparking Plug, Speedometer, Escalator, Sailing, Compass, Parachute, Hovercraft, ... and so much more.