Harold M.Stevens

The elevator is the most important machine most people have never thought about. The Elevators: The Complete Guide to Elevator Mechanics, History, and the Physics of Vertical Travel is the definitive popular science guide to the invention that made the modern city possible - written for curious minds who want the real story, not a textbook. Inside you'll discover: ? Why Elisha Otis cut a rope in front of a crowd in 1854 - and why it changed civilisation ? The ingenious counterweight system that lets a small motor lift two tonnes of steel and people with ease ? How elevator control systems use artificial intelligence to predict where you're going before you press a button ? The dramatic accidents that shaped today's safety systems - and why modern elevators almost never fail ? The ropeless, magnetically levitated elevators being built right now that will move horizontally as well as vertically ? Why the space elevator - a cable stretching 36, 000 kilometres to orbit - is no longer science fiction ? How one machine reshaped architecture, real estate, city planning, and human psychology simultaneously